DEPARTMENT OF PUBLIC HEALTH AND ENVIRONMENT
Hazardous Materials and Waste Management Division
6 CCR 1007-1
State Board of Health
RULES AND REGULATIONS PERTAINING TO RADIATION CONTROL
PART 1:
GENERAL PROVISIONS
1.1	Purpose and Scope.
1.1.1	Authority.
Rules and regulations set forth herein are adopted pursuant to the provisions of sections 25‑1‑108, 25‑1.5‑101(1)(k), 25‑1.5‑101(1)(l), and 25‑11‑104, CRS.
1.1.2	Basis and Purpose.
A statement of basis and purpose of these regulations is incorporated as part of these regulations; a ACCOMPANIES THIS PART AND CHANGES TO THIS PART.  A copy may be obtained from the Department.
1.1.3	Scope.
This part includes provisions generally applicable throughout all parts of these radiation control regulations.
1.1.4	Applicability
Except as otherwise specifically provided, these regulations apply to all persons who receive, possess, own, acquire, use, process, store, transfer, or dispose any source of radiation; provided, however, that nothing in these regulations shall apply to any person to the extent such person is subject to regulation by the U.S. Nuclear Regulatory Commission.1
1	Attention is directed to the fact that regulation by the State of source material, byproduct material, and special nuclear material in quantities not sufficient to form a critical mass is subject to the provisions of the agreement between the State and the U.S. Nuclear Regulatory Commission and to 10 CFR Part 150 (January 1, 20046) of the Commission's regulations.
1.1.5	PUBLISHED MATERIAL INCORPORATED BY REFERENCE.
PUBLISHED MATERIAL INCORPORATED IN PART 1 BY REFERENCE IS AVAILABLE IN ACCORD WITH SECTION 1.4.
1.2	Definitions.
1.2.1	DEFINITIONS OF GENERAL APPLICABILITY TO THE STATE OF COLORADO RULES AND REGULATIONS PERTAINING TO RADIATION CONTROL PROMULGATED BY THE DEPARTMENT PURSUANT TO THE PROVISIONS OF SECTIONS 25-1-108, 25-1.5-101(1)(K), 25-1.5-101(1)(L), AND 25-11-104, CRS, ARE SET FORTH IN SECTION 1.2.2, AND SHALL BE LIBERALLY CONSTRUED TO PROTECT THE PUBLIC HEALTH BY CONTROLLING EXCESS RADIATION.
1.2.2	As used in these regulations, these terms have the definitions set forth belowAS FOLLOWS. Additional definitions used only in a certain part of these regulations will be found in that part.
"A1" means the maximum activity of special form radioactive material permitted in a Type A package. This value is either listed in Appendix 17A, Table 17A1, or may be derived in accordance with the procedures prescribed in Appendix 17A.
"A2" means the maximum activity of radioactive material, other than special form, low specific activity (LSA) and surface contaminated object (SCO) material, permitted in a Type A package.  This value is either listed in Appendix 17A, Table 17A1, or may be derived in accordance with the procedures prescribed in Appendix 17A.
"Absorbed dose" means the energy imparted by ionizing radiation per unit mass of irradiated material. The units of absorbed dose are the gray (Gy) and the rad.
“ABSORBED DOSE RATE” MEANS ABSORBED DOSE PER UNIT TIME, FOR MACHINES WITH TIMERS, OR DOSE MONITOR UNIT PER UNIT TIME FOR LINEAR ACCELERATORS.
"Accelerator" means any machine capable of accelerating electrons, protons, deuterons, or other charged particles in a vacuum and of discharging the resultant particulate or other radiation into a medium at energies usually in excess of 1 MeV.  For purposes of this definition, "particle accelerator" is an equivalent term.
"Accelerator-produced RADIOACTIVE material” means any material made radioactive by a particle accelerator.
“Accident” means any unintended event (including an operating error, equipment failure or other mishap) which could (1) result in a dose in excess of regulatory limits on site or for the public or (2) have consequences or potential consequences which cannot be ignored from the point of view of protection or safety (such as an actual or potential substantial degradation of the level of protection or safety of the facility or release of radioactive material in sufficient quantity to warrant consideration of protective actions).
"Act" means Title 25, Article 11, Colorado Revised Statutes (CRS), as amended.
"Activity" means the rate of disintegration or transformation or decay of radioactive material. The units of activity are the becquerel (Bq) and the curie (Ci).
"Adult" means an individual 18 or more years of age.
"Agreement State" means any State with which the U.S. Nuclear Regulatory Commission or the U.S. Atomic Energy Commission has entered into an effective agreement under subsection 274b. of the Atomic Energy Act of 1954, as amended (73 Stat. 689).
“AIR KERMA” (K) MEANS THE KINETIC ENERGY RELEASED IN A GIVEN MASS OF AIR BY IONIZING RADIATION (SEE KERMA). THE SI UNIT OF AIR KERMA IS JOULE PER KILOGRAM.  THE SPECIAL NAME FOR THE UNIT OF KERMA IS THE GRAY (GY).
"Airborne radioactive material" means any radioactive material dispersed in the air in the form of dusts, fumes, particulates, mists, vapors, or gases.
"Airborne radioactivity area" means a room, enclosure, or area in which airborne radioactive materials exist in concentrations:
(1)	In excess of the derived air concentrations (DACs) specified in Appendix 4B, Table 4B1, or 
(2)	To such a degree that an individual present in the area without respiratory protective equipment could exceed, during the hours an individual is present in a week, an intake of 0.6 percent of the annual limit on intake (ALI) or 12 DAC‑hours.
"Air-purifying respirator" means a respirator with an air purifying filter, cartridge, or canister that removes specific air contaminants by passing ambient air through the air-purifying element.
"Airline respirator" (see "supplied-air respirator”).
"Alert" means an event may occur, is in progress, or has occurred that could lead to a release of radioactive material but that the release is not expected to require a response by offsite response organizations to protect persons offsite.
"Annual limit on intake" (ALI) means the derived limit for the amount of radioactive material taken into the body of an adult worker by inhalation or ingestion in a year. ALI is the smaller value of intake of a given radionuclide in a year by the reference man that would result in a committed effective dose equivalent of 0.05 Sv (5 rem) or a committed dose equivalent of 0.5 Sv (50 rem) to any individual organ or tissue. ALI values for intake by ingestion and by inhalation of selected radionuclides are given in Part 4, Appendix 4B, Table 4B1, Columns 1 and 2. 
“Annually” means either (1) at intervals not to exceed 1 year or (2) once per year, at about the same time each year (plus or minus 1 month).
“ANSI” means the American National Standards Institute.
"Assigned protection factor” (APF) means the expected workplace level of respiratory protection that would be provided by a properly functioning respirator or a class of respirators to properly fitted and trained users. Operationally, the inhaled concentration can be estimated by dividing the ambient airborne concentration by the APF.
"Atmosphere supplying respirator" means a respirator that supplies the respirator user with breathing air from a source independent of the ambient atmosphere, and includes supplied-air respirators (SARs) and self-contained breathing apparatus (SCBA) units.
"Background radiation" means radiation from: (1) extraterrestrial sources; (2) naturally occurring radioactive material (which has not been technologically enhanced), including radon, except as a decay product of source or special nuclear material; and (3) global fallout as it exists in the environment from the testing of nuclear explosive devices or from past nuclear accidents such as Chernobyl that are not under the control of the licensee or registrant.  "Background radiation" does not include sources of radiation from radioactive materials regulated by the Department.
"Becquerel" (Bq) means the SI unit of activity.  One becquerel is equal to 1 disintegration per second or transformation per second (dps or s-1).
"Bioassay" means the determination of kinds, quantities or concentrations, and, in some cases, the locations of radioactive material in the human body, whether by direct measurement, in-vivo counting, or by analysis and evaluation of materials excreted or removed from the human body.  For purposes of these regulations, "radiobioassay" is an equivalent term.
"Brachytherapy" means a method of radiation therapy in which plated, embedded, activated, or sealed sources are utilized to deliver a radiation dose at a distance of up to a few centimeters, by surface, intracavitary, intraluminal or interstitial application.
"Byproduct material" means: 
(1)	Any radioactive material, except special nuclear material, yielded in or made radioactive by exposure to the radiation incident to the process of producing or utilizing special nuclear material; and 
(2)	The tailings or wastes produced by the extraction or concentration of uranium or thorium from ore processed primarily for its source material content, including discrete surface wastes resulting from uranium or thorium solution extraction processes (.  Uunderground ore bodies depleted by these solution extraction operations do not constitute "byproduct material" within this definition.);
(3)	ANY MATERIAL PRODUCED, EXTRACTED, OR CONVERTED AFTER EXTRACTION, FOR USE FOR A COMMERCIAL, MEDICAL, OR RESEARCH ACTIVITY THAT:
(A)	IS A DISCRETE SOURCE OF RADIUM-226; OR 
(B)	HAS BEEN MADE RADIOACTIVE BY USE OF A PARTICLE ACCELERATOR; AND
 (4)	ANY DISCRETE SOURCE OF NATURALLY OCCURRING RADIOACTIVE MATERIAL, OTHER THAN SOURCE MATERIAL, THAT:
(A)	IS EXTRACTED, OR CONVERTED AFTER EXTRACTION, FOR USE FOR A COMMERCIAL, MEDICAL, OR RESEARCH ACTIVITY; AND
(B)	WOULD POSE A THREAT TO THE PUBLIC HEALTH AND SAFETY SIMILAR TO THE THREAT POSED BY A DISCRETE SOURCE OF RADIUM-226 OR THREAT DETERMINED BY NRC TO THE COMMON DEFENSE AND SECURITY.
"Calendar quarter" means A PERIOD OF TIME EQUAL TO ONE QUARTER OF THE YEAR (not less than 12 consecutive weeks nor more than 14 consecutive weeks) PROVIDING THAT THE BEGINNING OF THE FIRST QUARTER IN A YEAR COINCIDES WITH THE STARTING DATE OF THE YEAR AND THAT NO DAY OF THE YEAR IS OMITTED OR DUPLICATED IN SUCCESSIVE QUARTERS. The first calendar quarter of each year shall begin in January and subsequent calendar quarters shall be so arranged such that no day is included in more than one calendar quarter and no day in any one year is omitted from inclusion within a calendar quarter. The method used in determining calendar quarters for purposes of these regulations shall not be changed by any licensee or registrant except at the beginning of a year (see also “quarter” and “year”).
"Calibration" means the determination of (1) the response or reading of an instrument relative to a series of known radiation values over the range of the instrument or (2) the strength of a source of radiation relative to a standard.
“CCR” MEANS THE COLORADO CODE OF REGULATIONS.
"CFR" means Code of Federal Regulations.
"Chelating agent" means A SUBSTANCE THAT THROUGH BINDING ALLOWS EFFICIENT ELIMINATION OF RADIONUCLIDE CONTAMINATION FROM THE HUMAN BODY (DECORPORATION), FOR EXAMPLE, amine polycarboxylic acids, hydroxy carboxylic acids, and polycarboxylic acids.
"Class" means a classification scheme for inhaled material according to its rate of clearance from the pulmonary region of the lung.  Materials are classified as D, W, or Y, which applies to a range of clearance half-times: for class D, days, of less than 10 days, for class W, weeks, from 10 to 100 days, and for class Y, years, of greater than 100 days.  For purposes of these regulations, “lung class” and “inhalation class” are equivalent terms.
"Collective dose" means the sum of the individual doses received in a given period of time by a specified population from exposure to a specified source of radiation.
"Committed dose equivalent" (HT,50) means the dose equivalent to organs or tissues of reference (T) that will be received from an intake of radioactive material by an individual during the 50-year period following the intake.
"Committed effective dose equivalent" (HE,50) is the sum of the products of the weighting factors applicable to each of the body organs or tissues that are irradiated and the committed dose equivalent to each of these organs or tissues (HE,50 = S× WT×HT,50).
"Constraint" (dose constraint) means a value above which specified licensee actions are required.
“Continuing education unit” (CEU) means one documentable training or education contact hour.
“Cost estimate” means a document containing the total costs that would be incurred if an independent contractor were hired to perform decommissioning of the facility and disposal of radioactive materials at the facility, and associated administrative indirect and legal costs to the Department in conducting decommissioning oversight.
"Critical group" means the group of individuals reasonably expected to receive the greatest exposure to residual radioactivity for any applicable set of circumstances.
"CRS" means the Colorado Revised Statutes.
"Curie" means a unit of quantity of radioactivity.  One curie (Ci) is that quantity of radioactive material that decays at the rate of 3.7×1010 transformations per second (s-1).
“CYCLOTRON” MEANS A CIRCULAR PARTICLE ACCELERATOR IN WHICH A MAGNETIC FIELD BENDS THE PATH OF CHARGED PARTICLES.  A CYCLOTRON ACCELERATES CHARGED PARTICLES AT ENERGIES USUALLY IN EXCESS OF 10 MEGAELECTRON VOLTS AND IS COMMONLY USED FOR PRODUCTION OF SHORT HALF-LIFE RADIONUCLIDES FOR MEDICAL USE.
"Declared pregnant woman" means a woman who has voluntarily informed the licensee or registrant, in writing, of her pregnancy and the estimated date of conception. The declaration remains in effect until the declared pregnant woman withdraws the declaration in writing or is no longer pregnant.
"Decommission" means to remove a facility or site safely from service and reduce residual radioactivity to a level that permits: (1) release of the property for unrestricted use and termination of the license or (2) release of the property under restricted conditions and termination of the license.
"Decommissioning funding plan" means a written document that contains a cost estimate for decommissioning and a description of the method for assuring funds for decommissioning, including means of adjusting cost estimates and associated funding levels periodically over the life of the facility.
"Decommissioning plan" means a written document that includes the licensee’s planned procedures and activities for decommissioning of the facility or site.
"Deep dose equivalent" (HD), which applies to external whole body exposure, means the dose equivalent at a tissue depth of 1 centimeter (1000 mg/cm2).
"Demand respirator" means an atmosphere-supplying respirator that admits breathing air to the facepiece only when a negative pressure is created inside the facepiece by inhalation.
"Dentist" means an individual licensed by a State or Territory of the United States, the District of Columbia or the Commonwealth of Puerto Rico to practice dentistry.
"Department" means the Colorado Department of Public Health and Environment.
"Depleted uranium" means the source material uranium in which the isotope uranium 235 is less than 0.711 weight percent of the total uranium present.  Depleted uranium does not include special nuclear material.
"Derived air concentration" (DAC) means the concentration of a given radionuclide in air which, if breathed by the reference man for a working year of 2,000 hours under conditions of light work, results in an intake of one ALI.  For purposes of these regulations, the condition of light work is an inhalation rate of 1.2 cubic meters of air per hour for 2,000 hours in a year. DAC values are given in Part 4, Appendix 4B, Table 4B1, Column 3.
"Derived air concentration-hour" (DAC-hour) means the product of the concentration of radioactive material in air, expressed as a fraction or multiple of the derived air concentration for each radionuclide, and the time of exposure to that radionuclide, in hours. A licensee or registrant may take 2,000 DAC-hours to represent one ALI, equivalent to a committed effective dose equivalent of 0.05 Sv (5 rem).
“Direct supervision” means the supervisor must be present in the facility and immediately available to furnish assistance and direction to the supervisee throughout the performance of a procedure. The supervisor is not required to be present in the room when the procedure is performed.
“DISCRETE SOURCE” MEANS A RADIOACTIVE SOURCE WITH PHYSICAL BOUNDARIES, WHICH IS SEPARATE AND DISTINCT FROM THE RADIOACTIVITY PRESENT IN NATURE, AND IN WHICH THE RADIONUCLIDE CONCENTRATION HAS BEEN INCREASED BY HUMAN PROCESSES WITH THE INTENT THAT THE CONCENTRATED RADIOACTIVE MATERIAL WILL BE USED FOR ITS RADIOLOGICAL PROPERTIES.
"Disposable respirator" means a respirator for which maintenance is not intended and that is designed to be discarded after excessive breathing resistance, sorbent exhaustion, physical damage, or end of service life renders it unsuitable for use. Examples of this type of respirator are a disposable half mask respirator or a disposable escape-only self-contained breathing apparatus (SCBA).
"Distinguishable from background" means that the detectable concentration of a radionuclide is statistically different from the background concentration of that radionuclide in the vicinity of the site or, in the case of structures, in similar materials using adequate measurement technology, survey, and statistical techniques.
“DOE” MEANS THE U.S. DEPARTMENT OF ENERGY.
"Dose" is a generic term that means absorbed dose, dose equivalent, effective dose equivalent, committed dose equivalent, committed effective dose equivalent, total organ dose equivalent, or total effective dose equivalent. For purposes of these regulations, "radiation dose" is an equivalent term.
"Dose equivalent (HT)" means the product of the absorbed dose in tissue, quality factor, and all other necessary modifying factors at the location of interest. The units of dose equivalent are the sievert (Sv) and rem.
"Dose limits" means the permissible upper bounds of radiation doses established in accordance with these regulations. For purposes of these regulations, "limits" is an equivalent term.
"Dosimetry processor" means an individual or an organization that processes and evaluates individual monitoring devices in order to determine the radiation dose delivered to the monitoring devices.
“DOT” MEANS THE U.S. DEPARTMENT OF TRANSPORTATION.
"Drill" means a supervised, hands-on instruction period intended to test, develop or maintain a specific emergency response capability. A drill may be a component of an exercise.
"Effective dose equivalent” (HE) means the sum of the products of the dose equivalent to each organ or tissue (HT) and the weighting factor (WT) applicable to each of the body organs or tissues that are irradiated (HE = S× WT×HT).
"Embryo/fetus" means the developing human organism from conception until the time of birth.
"Emergency" means an event requiring prompt action to mitigate a threat to the health and safety of workers and the public or a threat of damage to the environment.
"Emergency planning zone" means a geographic area surrounding a specific facility for which special planning and preparedness efforts are carried out to ensure that prompt and effective protective actions can reduce or minimize the impact of releases of radioactive material to public health and safety or to the environment.
"Entrance or access point" means any location through which an individual could gain access to radiation areas or to licensed or registered radioactive materials. This includes entry or exit portals of sufficient size to permit human entry, irrespective of their intended use.
"Evacuation" means the urgent removal of people from an area to avoid or reduce high-level, short-term exposure.
"Event" means a situation reasonably discrete in time, location and consequences.
"Exercise" means a multi-faceted activity that tests the plans, procedures, adequacy of training, resources, and integrated capability of an emergency response system.
"Explosive material" means any chemical compound, mixture, or device which produces a substantial instantaneous release of gas and heat spontaneously or by contact with sparks or flame.
"Exposure" means being exposed to ionizing radiation or to radioactive material.
"Exposure" means the quotient of dQ by dm where "dQ" is the absolute value of the total charge of the ions of one sign produced in air when all the electrons (negatrons and positrons) liberated by photons in a volume element of air having mass "dm" are completely stopped in air.  The SI unit of exposure is the coulomb per kilogram (C/kg). See Section 1.14 units of exposure and dose for the special unit.2
2	When not underlined as above, or indicated as "exposure" (X), the term "exposure" has a more general meaning in these regulations.
"Exposure rate" means the exposure per unit of time, such as roentgen per minute and milliroentgen per hour.
"External dose" means that portion of the dose equivalent received from any source of radiation outside the body.
"Extremity" means hand, elbow, arm below the elbow, foot, knee, and leg below the knee.
“Facility” means the location within one building, or vehicle, or under one roof and under the same administrative control (1) at which the possession, use, processing or storage of radioactive material is or was authorized or (2) at which one or more radiation machines are or were installed, operated and / or located.  “Facility” may also mean multiple such locations at a site or part of a site.
“FDA” MEANS THE UNITED STATES FOOD AND DRUG ADMINISTRATION.
"Final radiation survey" means the survey of the facility or site after decommissioning activities have been completed during which the determination is made by the licensee that the facility or site meets the Department’s release criteria.
"Financial surety" or "financial warranty" means the method of assuring that sufficient funds will be available at the time of license termination and decommissioning of the facility to cover all costs associated with the decommissioning.
"Filtering facepiece" (dust mask) means a negative pressure particulate respirator with a filter as an integral part of the facepiece or with the entire facepiece composed of the filtering medium, not equipped with elastomeric sealing surfaces and adjustable straps.
“Fissile material” means the radionuclides uranium-233, uranium-235, plutonium-239, and plutonium-241, or any combination of these radionuclides. Fissile material means the fissile nuclides themselves, not material containing fissile nuclides. Unirradiated natural uranium and depleted uranium and natural uranium or depleted uranium, that has been irradiated in thermal reactors only, are not included in this definition.
"Fit factor" means a quantitative estimate of the fit of a particular respirator to a specific individual, and typically estimates the ratio of the concentration of a substance in ambient air to its concentration inside the respirator when worn.
"Fit test" means the use of a protocol to qualitatively or quantitatively evaluate the fit of a respirator on an individual.
"Former U.S. Atomic Energy Commission (AEC) or U.S. Nuclear Regulatory Commission (NRC) licensed facilities" means nuclear reactors, nuclear fuel reprocessing plants, uranium enrichment plants, or critical mass experimental facilities where AEC or NRC licenses have been terminated.
"General emergency" means an accident has occurred or is in progress which involves actual or imminent catastrophic reduction of facility safety systems with potential for loss of containment or confinement integrity or release of radioactive material that can be reasonably expected to exceed offsite protective action guides.3
3	A definition of “general emergency” is provided for reference and completeness. It is unlikely that any Colorado licensee would need to plan for a general emergency.
"General supervision" means the procedure is furnished under the supervisor’s overall direction and control but the supervisor’s presence is not required during the performance of the procedure.
"Generally applicable environmental radiation standards" means standards issued by the U.S. Environmental Protection Agency (EPA) under the authority of the Atomic Energy Act of 1954, as amended, that impose limits on radiation exposures or levels, or concentrations or quantities of radioactive material, in the general environment outside the boundaries of locations under the control of persons possessing or using radioactive material.
"Gray" (Gy) means the SI unit of absorbed dose.  One gray is equal to an absorbed dose resulting from deposition of 1 joule (J) of energy in 1 kilogram of material (100 rad).
"Hazardous waste" means those wastes designated as hazardous by Department regulations in 6 CCR 1007-1-3.
"Healing arts" means any system, treatment, operation, diagnosis, prescription, or practice for the ascertainment, cure, relief, palliation, adjustment, or correction of any human disease, ailment, deformity, injury or unhealthy or abnormal physical or mental condition.
"Helmet" (respiratory) means a rigid respiratory inlet covering that also provides head protection against impact and penetration.
“High radiation area” means an area, accessible to individuals, in which radiation levels from radiation sources external to the body could result in an individual receiving a dose equivalent in excess of 1 mSv (0.1 rem) in 1 hour at 30 centimeters from any source of radiation or 30 centimeters from any surface that the radiation penetrates.
"Hood" (respiratory) means a respiratory inlet covering that completely covers the head and neck and may also cover portions of the shoulders and torso.
"Human use" means the internal or external administration of radiation or radioactive material to human beings.
“ICRP” means the International Commission on Radiological Protection.”
"Immediate" means within not more than fifteen minutes or as otherwise specified in writing by the licensee and approved by the Department.
"Incident" means any unintended event involving radioactive material for which the public dose is a fraction of regulatory limits and safety provisions are sufficient, but further degradation of safety systems could lead to an accident condition.
"Individual" means any human being.
"Individual monitoring" means the assessment of:
(1)	Dose equivalent by the use of: 
(a)	Individual monitoring devices; or 
(b)	Survey data; or
(2)	Committed effective dose equivalent by:
(a)	Bioassay; or 
(b)	Determination of the time-weighted air concentrations to which an individual has been exposed, that is, DAC-hours. (See the definition of DAC-hours).
“Individual monitoring device” mean a device designed to be worn by a single individual for the assessment of dose equivalent. For purposes of these regulations, "personnel dosimeter" and "dosimeter" are equivalent terms. Examples of individual monitoring devices are film badges, thermoluminescence dosimeters (TLDs), pocket ionization chambers, optically stimulated luminescence (OSL) dosimeters and personal (lapel) air sampling devices.
“Inhalation class” (see “class”).
"Inspection" means an official examination or observation including but not limited to, tests, surveys, and monitoring to determine compliance with rules, regulations, orders, license conditions and other requirements of the Department.
"Interlock" means a device arranged or connected such that the occurrence of an event or condition is required before a second event or condition can occur or continue to occur.
"Internal dose" means that portion of the dose equivalent received from radioactive material taken into the body.
“KERMA” MEANS KINETIC ENERGY RELEASED IN A MASS, DETERMINED BY THE QUOTIENT OF dE BY dM, WHERE dE IS THE SUM OF THE INITIAL KINETIC ENERGIES OF ALL THE CHARGED IONIZING PARTICLES (ELECTRONS) LIBERATED BY UNCHARGED IONIZING PARTICLES (PHOTONS) IN MASS dM.
“KILO ELECTRON VOLT” (KEV) MEANS THE ENERGY EQUAL TO THAT ACQUIRED BY A PARTICLE WITH ONE ELECTRON CHARGE IN PASSING THROUGH A POTENTIAL DIFFERENCE OF ONE THOUSAND VOLTS IN A VACUUM.
“KILOVOLT” (KV) IS A UNIT (A THOUSAND VOLTS) USED TO MEASURE THE NOMINAL ACCELERATING POTENTIAL OF CHARGED PARTICLES USED TO CREATE AN X-RAY BEAM.
“Lens dose equivalent" (LDE) means the external exposure to the lens of the eye as the dose equivalent at a tissue depth of 0.3 centimeter (300 mg/cm2).
"License" means a license issued by the Department in accordance with the regulations adopted by the Department.
"Licensed material" means radioactive material received, possessed, used, transferred or disposed of under a general or specific license issued by the Department.
"Licensee" means any person who is licensed by the Department in accordance with these regulations and the Act. "Licensee" also means any person who is responsible for decommissioning by being registered with the Department, being subject to a record of possession of a radiation source or device under general license (for example, pursuant to 3.6.4.3(13)), or being otherwise legally obligated to conduct decommissioning activities in accordance with these regulations and the Act.
"Licensing State" means any State which has been finally designated as such by the Conference of Radiation Control Program Directors, Inc., based upon having regulations for control of radiation relating to naturally occurring or accelerator produced radioactive material (NARM) and an effective program for the regulatory control of NARM.4
4	For the purpose of meeting the definition of a Licensing State by the Conference of Radiation Control Program Directors, Inc. (CRCPD), NARM refers only to discrete sources of NARM. Diffuse sources of NARM are excluded from consideration by the CRCPD for Licensing State designation purposes.
"Limits" (see "dose limits").
"Loose-fitting facepiece" means a respiratory inlet covering that is designed to form a partial seal with the face.
"Lost or missing licensed source of radiation" means licensed or registered source(s) of radiation whose location is unknown. This definition includes licensed material that has been shipped but has not reached its planned destination and whose location cannot be readily traced in the transportation system.
“Lung class” (see “class”).
"Mammographer" means a person who operates a machine source of ionizing radiation, commonly known as an "x-ray machine", in the conduct of a mammography exam.
"Major processor" means a user processing, handling, or manufacturing radioactive material exceeding Type A quantities as unsealed sources or material, or exceeding 4 times Type B quantities as sealed sources, but does not include nuclear medicine programs, universities, industrial radiographers, or small industrial programs. Type A and B quantities are defined in Part 17 of these regulations.
"Management" means the chief executive officer, or other individual having the authority to manage, direct, or administer the licensee's activities, or such person’s delegate(s).
"Medical institution" means an organization in which two or more medical disciplines are practiced.
"Medical use” means the intentional internal or external administration of radioactive material or radiation to humans in the practice of the healing arts, including administration of radioactive materials to patients or human research subjects under the supervision of an authorized user and operation of radiation machines.
"Member of the public" means an individual, except when that individual is receiving an occupational dose.
“MeV” means one mega electron volt, or one million electron volts. One MeV is the amount of energy acquired by a particle with one electron charge in passing through a potential difference of one million volts in a vacuum. One MeV is equivalent to 1.60×10-16 joules.
"Minor" means an individual less than 18 years of age.
“MQSA” MEANS MAMMOGRAPHY QUALITY STANDARDS ACT.
"Monitoring" means the measurement of radiation, radioactive material concentrations, surface area activities or quantities of radioactive material and the use of the results of these measurements to evaluate potential exposures and doses. For purposes of these regulations, "radiation monitoring" and "radiation protection monitoring" are equivalent terms.
"NARM" means any naturally occurring or accelerator‑produced radioactive material.  NARM does not include byproduct, source, or special nuclear material.5
5	For the purpose of meeting the definition of a Licensing State by the Conference of Radiation Control Program Directors, Inc. (CRCPD), NARM refers only to discrete sources of NARM. Diffuse sources of NARM are excluded from consideration by the CRCPD for Licensing State designation purposes.
"Natural radioactivity" means radioactivity of naturally occurring nuclides.
"Natural thorium" means thorium with the naturally occurring distribution of thorium isotopes (essentially 100 weight per cent thorium 232).
"Natural uranium" means uranium containing a mixture of the uranium isotopes 234, 235 and 238 (approximately 0.7 weight percent uranium-235 and the remainder by weight essentially uranium‑238) that is neither enriched nor depleted in the isotope uranium 235.
“NCRP” means the National Council on Radiation Protection and Measurements.
"Negative-pressure respirator" (tight-fitting) means a respirator in which the air pressure inside the facepiece is negative during inhalation with respect to the ambient air pressure outside the respirator.
“NIST” MEANS THE NATIONAL INSTITUTE OF STANDARDS AND TECHNOLOGY.
“Nonstochastic effect” means a health effect, the severity of which varies with the dose and for which a threshold is believed to exist. Radiation-induced cataract formation is an example of a nonstochastic effect. For purposes of these regulations, “deterministic effect” is an equivalent term.
"Normal form radioactive material" means radioactive material that has not been demonstrated to qualify as "special form radioactive material".
"NRC" (see "Nuclear Regulatory Commission").
"Nuclear Regulatory Commission" (NRC) means the U.S. Nuclear Regulatory Commission or its duly authorized representatives.
"Occupational dose" means the dose received by an individual in the course of employment in which the individual's assigned duties involve exposure to radiation or to radioactive material from licensed and unlicensed sources of radiation whether or not the sources of radiation are in the possession of the licensee, registrant or other person. Occupational dose does not include doses received (1) from background radiation, (2) from any medical administration the individual has received, (3) from exposure to individuals administered radioactive material and released in accordance with Section 7.26 of these regulations, (4) from voluntary participation in medical research programs, or (5) as a member of the public.
“Offsite response organization" means the non-licensee offsite organizations that may be needed to respond to an emergency, including, but not limited to, local fire, police, ambulance and hospital services.
"Package" means the packaging together with its radioactive contents as presented for transport.
"Particle accelerator" (see "accelerator").
"Person" means any individual, corporation, partnership, firm, association, trust, estate, public or private institution, group, agency, political subdivision of this State, any other State or political subdivision or agency thereof, and any legal successor, representative, agent, or agency of the foregoing.
“Personal supervision” means the supervisor must be in attendance in the room with the supervisee during the performance of the procedure.
"Personnel monitoring equipment" (see "individual monitoring device").
“PET” MEANS POSITRON EMISSION TOMOGRAPHY (SEE “POSITRON EMISSION TOMOGRAPHY RADIONUCLIDE PRODUCTION FACILITY”).
"Pharmacist" means an individual licensed by a State or Territory of the United States, the District of Columbia or the Commonwealth of Puerto Rico to practice pharmacy.
"Physician" means an individual licensed by a State or Territory of the United States, the District of Columbia or the Commonwealth of Puerto Rico to dispense drugs in the practice of medicine.
“Planned special exposure” means an infrequent exposure to radiation, separate from and in addition to the annual occupational dose limits.
"Podiatrist" means an individual licensed by a State or Territory of the United States, the District of Columbia or the Commonwealth of Puerto Rico to practice podiatry.
“POSITRON EMISSION TOMOGRAPHY (PET) RADIONUCLIDE PRODUCTION FACILITY” MEANS A FACILITY OPERATING A CYCLOTRON OR ACCELERATOR FOR THE PURPOSE OF PRODUCING POSITRON EMISSION TOMOGRAPHY (PET) RADIONUCLIDES.
"Principal activity" means an activity authorized by the license which is essential to achieving the purpose(s) for which the license was issued or amended.  Not included as principal activities are (1) radioactive material storage while no licensed material is accessed for use or disposal and (2) activity incidental to decontamination or decommissioning.
"Positive-pressure respirator" means a respirator in which the pressure inside the respiratory inlet covering exceeds the ambient air pressure outside the respirator.
“Powered air-purifying respirator" (PAPR) means an air-purifying respirator that uses a blower to force the ambient air through air-purifying elements to the facepiece.
“Pressure-demand respirator” means a positive-pressure atmosphere-supplying respirator that admits breathing air to the facepiece when the positive pressure is reduced inside the facepiece by inhalation.
“Projected dose" means a future dose calculated for a specified time period on the basis of estimated or measured initial concentrations of radionuclides or exposure rates and in the absence of protective actions.
"Protective action" means an action taken by members of the public to protect themselves from radiation from an accident involving radioactive material. Protective action may include sheltering, evacuation, relocation, control of access, administration of a radioprotective drug, decontamination of persons, decontamination of land or property, or control of food or water.
"Protective action guide" means a projected dose from an accidental release of radioactive material at which protective action is to be considered.
"Public dose" means the dose received by a member of the public from exposure to radiation or radioactive material released by a licensee, or to any other source of radiation under the control of a licensee. Public dose does not include occupational dose, or doses received from background radiation, from any medical administration the individual has received, from exposure to individuals administered radioactive material and released in accordance with Section 7.26 of these regulations, or from voluntary participation in medical research programs.
"Pyrophoric liquid" means any liquid that ignites spontaneously in dry or moist air at or below 130 oF (54.4 oC). A pyrophoric solid is any solid material, other than one classed as an explosive, which under normal conditions is liable to cause fires through friction, retained heat from manufacturing or processing, or which can be ignited readily and, when ignited, burns so vigorously and persistently as to create a serious transportation, handling, or disposal hazard.  Included are spontaneously combustible and water reactive materials.
"Qualified expert" means an individual, approved by the Department, having the knowledge and training to measure ionizing radiation, to evaluate safety techniques, and to advise regarding radiation protection needs.  The individual shall receive approval from the dDepartment for specific activities and shall:
(1)	Be certified in the appropriate field by the American Board of Radiology, the American Board of Health Physics, the American Board of Medical Physics or the American Board of Nuclear Medicine Science; or 
(2)	Hold a master's or doctor's degree in physics, biophysics, radiological physics, health physics, or medical physics and have completed 1 year of documented, full time training in the appropriate field and also 1 year of documented, full-time work experience under the supervision of a qualified expert in the appropriate field. To meet this requirement, the individual shall have performed the tasks required of a qualified expert during the year of work experience.
"Qualitative fit test" (QLFT) means a pass/fail fit test to assess the adequacy of respirator fit that relies on the individual's response to the test agent.
"Quality factor" (Q) means the modifying factor, listed in 1.14, Table 1-2 or Table 1-3, that is used to derive dose equivalent from absorbed dose.
"Quantitative fit test" (QNFT) means an assessment of the adequacy of respirator fit by numerically measuring the amount of leakage into the respirator.
“Quarter” means a period of time equal to one-fourth of the year observed by the licensee, approximately 13 consecutive weeks, providing that the beginning of the first quarter in a year coincides with the starting date of the year and that no day OF THE YEAR is omitted or duplicated in consecutive quarters (see also “calendar quarter” and “year”).
"Rad" means the special unit of absorbed dose. One rad is equal to an absorbed dose of 100 ergs per gram or 0.01 joule per kilogram (0.01 gray).
"Radiation" means alpha particles, beta particles, gamma rays, X rays, neutrons, high-speed electrons, high-speed protons, and other particles capable of producing ions. For purposes of these regulations, ionizing radiation is an equivalent term. Radiation, as used in these regulations, does not include non-ionizing radiation, such as radiowaves or microwaves, visible, infrared, or ultraviolet light.
"Radiation area" means any area, accessible to individuals, in which radiation levels could result in an individual receiving a dose equivalent in excess of 0.05 mSv (0.005 rem) in 1 hour at 30 centimeters from the source of radiation or from any surface that the radiation penetrates.
"Radiation dose" (see "dose").
"Radiation machine" means any device capable of producing radiation except, those devices with radioactive material as the only source of radiation.
"Radiation safety officer" (RSO) means an individual who has demonstrated sufficient knowledge to apply radiation protection regulations appropriately and who has been assigned such responsibility by the licensee or registrant.
"Radioactive material" means any solid, liquid, or gas which emits radiation spontaneously.
"Radioactivity" means the transformation of unstable atomic nuclei by the emission of radiation.
"Radiobioassay" (see "bioassay").
“Reference man” means a hypothetical aggregation of human physical and physiological characteristics determined by international consensus. These characteristics may be used by researchers and public health workers to standardize results of experiments and to relate biological insult to a common base. A description of the reference man is contained in International Commission On Radiological Protection (ICRP) Publication 23, “Report Of The Task Group On Reference Man,” 1975.
"Registrant" means any person who is registered with the Department and is legally obligated to register with the Department pursuant to these regulations and the Act.
"Registration" means registration with the Department in accordance with the regulations adopted by the Department.
"Regulations of the U.S. Department of Transportation" means the regulations in 49 CFR Parts 100-189 and Parts 390-397 (October 1, 20035).
"Relocation" means the removal or, after a plume has passed, continued exclusion of people from contaminated areas to avoid chronic radiation dose.
"Rem" means the special unit of any of the quantities expressed as dose equivalent. The dose equivalent in rem is equal to the absorbed dose in rad multiplied by the quality factor (1 rem = 0.01 sievert).
"Research and development" means (1) theoretical analysis, exploration, or experimentation or (2) the extension of investigative findings and theories of a scientific or technical nature into practical application for experimental and demonstration purposes, including the experimental production and testing of models, devices, equipment, materials, and processes. Research and development does not include the internal or external administration of radiation or radioactive material to human beings.
“Residual radioactivity” means radioactivity in structures, materiel, soils, groundwater, and other media at a site resulting from activities under the licensee's control. This includes radioactivity from all licensed and unlicensed sources used by the licensee, but excludes background radiation. It also includes radioactive materials remaining at the site as a result of routine or accidental releases of radioactive material at the site and previous burials at the site, even if those burials were made in accordance with the provisions of Part 4 of these regulations.
"Respiratory protective equipment" means an apparatus, such as a respirator, used to reduce an individual's intake of airborne radioactive materials.
"Restricted area" means an area, access to which is limited by the licensee or registrant for the purpose of protecting individuals against undue risks from exposure to sources of radiation. Restricted area does not include areas used as residential quarters, but separate rooms in a residential building may be set apart as a restricted area.
"Restricted use" means that a limit or control has been placed on future use of the facility and the facility is no longer under the control of the licensee, registrant, of holder of the record of possession (SEE ALSO “UNRESTRICTED USE”).
"Roentgen" means the special unit of exposure.  One roentgen (R) equals 2.58×10 -4 coulombs/kilogram of air (see "Eexposure").
“Sanitary sewerage” means a system of public sewers for carrying off waste water and refuse, but excluding sewage treatment facilities, septic tanks, and leach fields owned or operated by the licensee or registrant.
"Sealed source" means radioactive material that is permanently bonded or fixed in a capsule or matrix designed to prevent release and dispersal of the radioactive material under the most severe conditions which are likely to be encountered in normal use and handling.
“Sealed source and device registry” (SSD) means the national registry, maintained by the U.S. Nuclear Regulatory Commission (NRC), which contains the registration certificates that summarize the radiation safety information for sealed sources and devices and describe the licensing and use conditions approved for the product.
"Self-contained breathing apparatus" (SCBA) means an atmosphere-supplying respirator for which the breathing air source is designed to be carried by the user.
"Shallow dose equivalent" (HS), which applies to the external exposure of the skin of the whole body or the skin of an extremity, means the dose equivalent at a tissue depth of 0.007 centimeter (7 mg/cm2).
“Sheltering" means the use of a structure for radiation protection from an airborne plume containing radioactive material.
"SI" means the abbreviation for the international system of units.
"Sievert" means the SI unit of any of the quantities expressed as dose equivalent. The dose equivalent in sievert is equal to the absorbed dose in gray multiplied by the quality factor (1 Sv = 100 rem).
"Site" means the area within the boundary of a location under the control of persons generating or storing radioactive materials.
"Site boundary" means that line beyond which the land or property is not owned, leased, or otherwise controlled by the licensee or registrant.
"Site area emergency" means an event may occur, is in progress, or has occurred that could lead to a significant release of radioactive material and that could require a response by offsite response organizations to protect persons offsite.
"Source material" means material, in any physical or chemical form, including ores, that contain by weight one-twentieth of 1 percent (0.05 percent) or more of uranium, thorium or any combination thereof. Source material does not include special nuclear material.
"Source material milling" means any activity that results in the production of byproduct material as defined by definition (2) of byproduct material.
"Source of radiation" means any radioactive material or any device or equipment emitting, or capable of producing, radiation.
"Special form radioactive material" means radioactive material that satisfies the following conditions:
(1)	It is either a single solid piece or is contained in a sealed capsule that can be opened only by destroying the capsule;
(2)	The piece or capsule has at least one dimension not less than 5 millimeters (0.2 inch); and
(3)	It satisfies the test requirements specified by the Nuclear Regulatory Commission. A special form encapsulation designed in accordance with the Nuclear Regulatory Commission requirements in effect on June 30, 1983, and constructed prior to July 1, 1985, may continue to be used. A special form encapsulation designed in accordance with the Nuclear Regulatory Commission requirements in effect on March 31, 1996, and constructed prior to April 1, 1998, may continue to be used. A special form encapsulation either designed or constructed after April 1, 1998, must meet requirements of this definition applicable at the time of its design or construction.
"Special nuclear material" means: 
(1)	Plutonium, uranium-233, uranium enriched in the isotope 233 or in the isotope 235, and any other material that the U.S. Nuclear Regulatory Commission, pursuant to the provisions of Section 51 of the Atomic Energy Act of 1954, as amended, determines to be special nuclear material, but does not include source material; or
(2)	Any material artificially enriched by any of the foregoing but does not include source material.
"Special nuclear material in quantities not sufficient to form a critical mass" means uranium enriched in the isotope 235U in quantities not exceeding 350 grams of contained 235U; 233U in quantities not exceeding 200 grams; plutonium in quantities not exceeding 200 grams; or any combination of them in accordance with the following formula: For each kind of special nuclear material, determine the ratio between the quantity of that special nuclear material and the quantity specified above for the same kind of special nuclear material. The sum of such ratios for all of the kinds of special nuclear material in combination shall not exceed 1. For example, the following quantities in combination would not exceed the limitation and are within the formula:
175 (grams contained 235U)	+	50 (grams contained 233U)	+	50 (grams Pu)	≤ 1	
350	 	200	 	200	 	
"Specific activity of a radionuclide" means the radioactivity of the radionuclide per unit mass of that nuclide. The specific activity of a material in which the radionuclide is essentially uniformly distributed is the radioactivity per unit mass of the material.
“Spent nuclear fuel” or “spent fuel” means fuel that has been withdrawn from a nuclear reactor following irradiation, has undergone at least 1 year's decay since being used as a source of energy in a power reactor, and has not been chemically separated into its constituent elements by reprocessing. Spent fuel includes the special nuclear material, byproduct material, source material, and other radioactive materials associated with fuel assemblies.
“Stochastic effect” means a health effect that occurs randomly and for which the probability of the effect occurring, rather than its severity, is assumed to be a linear function of dose without threshold. Hereditary effects and cancer incidence are examples of stochastic effects. For purposes of these regulations, “probabilistic effect” is an equivalent term.
"Supplied-air respirator" (SAR) or airline respirator means an atmosphere-supplying respirator for which the source of breathing air is not designed to be carried by the user.
"Survey" means an evaluation of the radiological conditions and potential hazards incident to the production, use, transfer, release, disposal, or presence of sources of radiation. When appropriate, such evaluation includes, but is not limited to, tests, physical examinations, and measurements of levels of radiation or concentrations of radioactive material present.
"Test" means the process of verifying compliance with an applicable regulation.
"These regulations" mean all parts of the State of Colorado “Rules and Regulations Pertaining to Radiation Control,” 6 CCR 1007-1.
"Tight-fitting facepiece" means a respiratory inlet covering that forms a complete seal with the face.
"Total effective dose equivalent" (TEDE) means the sum of the deep dose equivalent for external exposures and the committed effective dose equivalent for internal exposures.
"Total organ dose equivalent" (TODE) means the sum of the deep dose equivalent and the committed dose equivalent to the organ receiving the highest dose.
"U.S. Department of Energy" means the Department of Energy established by Public Law 95-91, August 4, 1977, 91 Stat. 565, 42 U.S.C. 7101 et seq., to the extent that the Department exercises functions formerly vested in the U.S. Atomic Energy Commission, its Chairman, members, officers and components and transferred to the U.S. Energy Research and Development Administration and to the Administrator thereof pursuant to Sections 104(b), (c) and (d) of the Energy Reorganization Act of 1974 (Public Law 93 438, October 11, 1974, 88 Stat. 1233 at 1237 42 U.S.C. 5814, effective January 19, 1975) and retransferred to the Secretary of Energy pursuant to Section 301(a) of the Department of Energy Organization Act (Public Law 95-91, August 4, 1977, 91 Stat. 565 at 577-578, 42 U.S.C. 7151, effective October 1, 1977).
“UNIRRADIATED URANIUM” MEANS URANIUM CONTAINING NOT MORE THAN 2 X 103 BQ OF PLUTONIUM PER GRAM OF URANIUM-235, NOT MORE THAN 9 X 106 BQ OF FISSION PRODUCTS PER GRAM OF URANIUM-235, AND NOT MORE THAN 5 X 10-3 G OF URANIUM-236 PER GRAM OF URANIUM-235.
"Unrefined and unprocessed ore" means ore in its natural form prior to any processing, such as grinding, roasting, beneficiating, or refining.
"Unrestricted area" means an area, access to which is neither limited nor controlled by the licensee or registrant. For purposes of these regulations, "uncontrolled area" is an equivalent term.
"Unrestricted use" means that the facility or area may be used by individuals for any purpose without limits or controls. The facility or area is no longer under the control of the licensee, registrant, or holder of the record of possession (SEE ALSO “RESTRICTED USE”).
"Uranium - depleted, enriched" 
(1)	"Depleted uranium" means uranium containing less uranium-235 than the naturally occurring distribution of uranium isotopes.
(2)	"Enriched uranium" means uranium containing more uranium-235 than the naturally occurring distribution of uranium isotopes.
"User seal check" (fit check) means an action conducted by the respirator user to determine if the respirator is properly seated to the face. Examples include negative pressure check, positive pressure check, irritant smoke check, or isoamylacetate check.
"Very high radiation area" means an area, accessible to individuals, in which radiation levels from radiation sources external to the body could result in an individual receiving an absorbed dose in excess of 5 Gy (500 rad) in 1 hour at 1 meter from a source of radiation or 1 meter from any surface that the radiation penetrates.6
6	At very high doses received at high dose rates, units of absorbed dose, gray and rad, are appropriate, rather than units of dose equivalent, sievert and rem.
"Waste" means those low level radioactive wastes that are acceptable for disposal in a land disposal facility. For the purposes of this definition, low level waste has the same meaning as in the Low Level Radioactive Waste Policy Act, P.L. 96-573, as amended by P.L. 99-240, effective January 15, 1986, AND CONSISTENT WITH THE ENERGY POLICY ACT OF 2005, P.L. 109‑58; that is, radioactive waste (a) not classified as high level radioactive waste, spent nuclear fuel, or byproduct material as defined in Section 11e.(2) of the Atomic Energy Act (uranium or thorium tailings and waste) OR SECTIONS 11e.(3) OR 11e.(4) OF THE ATOMIC ENERGY ACT and (b) classified as low level radioactive waste consistent with existing law and in accordance with (a) by the U.S. Nuclear Regulatory Commission.
"Waste handling licensees" means persons licensed to receive and store radioactive wastes prior to disposal and/or persons licensed to dispose of radioactive waste.
"Week" means 7 consecutive days starting on Sunday.
“Weighting factor” (wT) for an organ or tissue (T) means the proportion of the risk of stochastic effects resulting from irradiation of that organ or tissue to the total risk of stochastic effects when the whole body is irradiated uniformly. For calculating the effective dose equivalent, the values of wT are:
TABLE 1-1: ORGAN DOSE WEIGHTING FACTORS	
Organ Or Tissue	WT	
Gonads	0.25	
Breast	0.15	
Red Bone Marrow	0.12	
Lung	0.12	
Thyroid	0.03	
Bone Surfaces	0.03	
Remainder7	0.30	
Whole Body8	1.00	
7	0.30 results from 0.06 for each of 5 “remainder” organs, excluding the skin and the lens of the eye, that receive the highest doses.
8	For the purpose of weighting the external whole body dose, for adding it to the internal dose, a single weighting factor, wT= 1.0, has been specified. The use of other weighting factors for external exposure will be approved on a case-by-case basis until such time as specific guidance is issued.
"Whole body" means, for purposes of external exposure, head, trunk including male gonads, arms above the elbow, or legs above the knee.
"Worker" means an individual engaged in work under a license or registration issued by the Department and controlled by a licensee or registrant.
"Working level" (WL) means any combination of short-lived radon daughters in 1 liter of air that will result in the ultimate emission of 1.3×105 MeV of potential alpha particle energy. The short-lived radon daughters are: for radon-222:  polonium-218, lead-214, bismuth-214, and polonium‑214; and for radon-220: polonium-216, lead-212, bismuth-212, and polonium-212.
"Working level month" (WLM) means an exposure to 1 working level for 170 hours -- 2,000 working hours per year divided by 12 months per year is approximately equal to 170 hours per month.
"Year" means the period of time beginning in January used to determine compliance with the provisions of these regulations. The licensee or registrant may change the starting date of the year used to determine compliance by the licensee or registrant provided that the change is made at the beginning of the year. If a transition from one licensee or registrant to another occurs during a year, each licensee or registrant shall assure that no day is omitted or duplicated in consecutive years (see also “calendar quarter” and “quarter”).
COMMUNICATIONS AND REFERENCED MATERIALS
1.3	Communications.
All communications and reports concerning parts of these regulations, and applications filed thereunder, should be addressed to the Department.
1.4	Referenced Materials.
1.4.1	Parts of these regulations incorporate by reference (as identified within a particular section) materials originally published elsewhere. These regulations do not include amendments to or editions of incorporated materials published later than the effective date of the particular section.
1.4.2	The Department of Public Health and Environment maintains copies of the complete text of the incorporated materials for public inspection during regular business hours.
1.4.3	The Hazardous Materials And Waste Management Division will provide certified copies of any non-copyrighted referenced material at cost upon request.  Information regarding how the incorporated material may be obtained or examined is available from:
Director, Hazardous Materials And Waste Management Division
Colorado Department of Public Health and Environment
4300 Cherry Creek Drive South
Denver, CO 80246-1530
1.4.4	In accordance with SECTION 24‑4‑103(12.5)(c)(II)(C), CRS, copies of any material that has been incorporated by reference have been provided to the State Publications Depository Library and Distribution Center and are available for interlibrary loan. The incorporated materials may be examined at any state publications depository library.
EXEMPTIONS FROM THE REGULATORY REQUIREMENTS
1.5	Exemptions.
1.5.1	General Provision.
The Department may, upon application or upon its own initiative, grant such exemptions or exceptions from the requirements of these regulations as it determines are authorized by law and will not result in undue hazard to public health and safety or property.
1.5.2	U.S. Department of Energy Contractors and U.S. Nuclear Regulatory Commission Contractors.
Any U.S. Department of Energy contractor or subcontractor and any U.S. Nuclear Regulatory Commission contractor or subcontractor of the following categories operating within this State is exempt from these regulations to the extent that such contractor or subcontractor under his contract receives, possesses, uses, transfers or acquires sources of radiation:
1.5.2.1	Prime contractors performing work for the U.S. Department of Energy at U.S. Government‑owned or ‑controlled sites, including the transportation of sources of radiation to or from such sites and the performance of contract services during temporary interruptions of such transportation;
1.5.2.2	Prime contractors of the U.S. Department of Energy performing research in, or development, manufacture, storage, testing, or transportation of, atomic weapons or components thereof;
1.5.2.3	Prime contractors of the U.S. Department of Energy using or operating nuclear reactors or other nuclear devices in a United States Government‑owned vehicle or vessel; and
1.5.2.4	Any other prime contractor or subcontractor of the U.S. Department of Energy or of the U.S. Nuclear Regulatory Commission when the State and the U.S. Nuclear Regulatory Commission jointly determine that:
(1)	The exemption of the prime contractor or subcontractor is authorized by law; and
(2)	Under the terms of the contract or subcontract, there is adequate assurance that the work thereunder can be accomplished without undue risk to the public health and safety.
GENERAL REGULATORY REQUIREMENTS
1.6	Records.
Each licensee and registrant shall maintain records showing the receipt, transfer, and disposal of all sources of radiation. Additional record requirements are specified elsewhere in these regulations.
1.7	Inspections.
1.7.1	Each licensee and registrant shall afford the Department at all reasonable times opportunity to inspect sources of radiation and the premises and facilities wherein such sources of radiation are used or stored.
1.7.2	Each licensee and registrant shall make available to the Department for inspection, at all reasonable times, records maintained pursuant to these regulations.
1.8	Tests.
Each licensee and registrant shall perform upon instructions from the Department, or shall permit the Department to perform, such reasonable tests as the Department deems appropriate or necessary including, but not limited to, tests of:
1.8.1	Sources of radiation;
1.8.2	Facilities wherein sources of radiation are used or stored;
1.8.3	Radiation detection and monitoring instruments; and
1.8.4	Other equipment and devices used in connection with utilization or storage of licensed or registered sources of radiation.
ADDITIONAL REGULATORY REQUIREMENTS
1.9	Additional Requirements.
The Department may, by rule, regulation, or order, impose upon any licensee or registrant such requirements in addition to those established in these regulations as it deems appropriate or necessary to minimize danger to public health and safety or property.
ENFORCEMENT REQUIREMENTS
1.10	Violations.
An injunction or other court order may be obtained prohibiting any violation of any provision of the Act or any regulation or order issued thereunder. Any person who willfully violates any provision of the Act or any regulation or order issued thereunder may be guilty of a misdemeanor and, upon conviction, may be punished by fine or imprisonment or both, as provided by law. Additionally, any person who violates any provision of the Act or any regulation may be subject to a civil penalty as provided for in Part 13 or these regulations.
1.11	Impounding.
Sources of radiation shall be subject to impounding pursuant to the Act.
1.12	Prohibited Uses.
1.12.1	A hand-held fluoroscopic screen shall not be used with x-ray equipment unless it has been listed in the registry of sealed source and devices or accepted for certification by the U.S. Food and Drug Administration, Center for Devices and Radiological Health.
1.12.2	A shoe-fitting fluoroscopic device shall not be used.
SEVERABILITY
1.13	Severability.
The provisions of parts of these regulations are severable, and if any provisions or the application of the provisions to any circumstances is held invalid, the application of such provision to other circumstances, and the remainder of this regulation shall not be affected thereby.
INFORMATIONAL PROVISIONS
1.14	The International System of Units (SI).
For purposes of these regulations:
1.14.1	The unit of exposure is the coulomb per kilogram (C/kg) of air. One roentgen is equal to 2.58×10-4 coulomb per kilogram.
1.14.2	The units of dose are:
1.14.2.1	gray (Gy) is the SI unit of absorbed dose. One gray is equal to an absorbed dose of 1 joule per kilogram (100 rad).
1.14.2.2	rad is the special unit of absorbed dose. One rad is equal to an absorbed dose of 100 ergs per gram or 0.01 joule per kilogram (0.01 Gy).
1.14.2.3	rem is the special unit of any of the quantities expressed as dose equivalent.  The dose equivalent in rem is equal to the absorbed dose in rad multiplied by the quality factor (1 rem = 0.01 Sv).
1.14.2.4	sievert is the SI unit of any of the quantities expressed as dose equivalent. The dose equivalent in sievert is equal to the absorbed dose in gray multiplied by the quality factor (1 Sv = 100 rem).
1.14.3	The quality factors for converting absorbed dose to dose equivalent are shown in Table 1-2.
TABLE 1-2:  QUALITY FACTORS AND ABSORBED DOSE EQUIVALENCIES	
Type of radiation	Quality factor (Q)	Absorbed dose equal to a unit dose equivalent9	
X, gamma, or beta radiation and high-speed electrons	1	1	
Alpha particles, multiple-charged particles, fission fragments and heavy particles of unknown charge	20	0.05	
Neutrons of unknown energy	10	0.1	
High-energy protons	10	0.1	
9	Absorbed dose in gray equal to 1 Sv or the absorbed dose in rad equal to 1 rem.
1.14.4	If it is more convenient to measure the neutron fluence rate than to determine the neutron dose equivalent rate in sievert per hour or rem per hour, as provided in 1.14.3, 0.01 Sv (1 rem) of neutron radiation of unknown energies may be assumed to result from a total fluence of 25 million neutrons per square centimeter incident upon the body. If sufficient information exists to estimate the approximate energy distribution of the neutrons, the licensee or registrant may use the fluence rate per unit dose equivalent or the appropriate Q value from Table 1-3 to convert a measured tissue dose in gray or rad to dose equivalent in sievert or rem.
TABLE 1-3:  MEAN QUALITY FACTORS (Q) AND FLUENCE PER UNIT DOSE EQUIVALENT FOR MONOENERGETIC NEUTRONS	
Neutron energy (MeV)	Quality factor10 (Q)	Fluence per unit dose equivalent11  (neutrons cm-2 rem-1)	Fluence per unit dose equivalent11 (neutrons cm-2 Sv-1)	
 2.5×10-8
(thermal)	2	980×106	980×108	
 1×10-7	2	980×106	980×108	
 1×10-6	2	810×106	810×108	
 1×10-5	2	810×106	810×108	
 1×10-4	2	840×106	840×108	
 1×10-3	2	980×106	980×108	
 1×10-2	2.5	1010×106	1010×108	
 1×10-1	7.5	170×106	170×108	
 5×10-1	11	 39×106	 39×108	
    1	11	 27×106	 27×108	
    2.5	9	 29×106	 29×108	
    5	8	 23×106	 23×108	
    7	7	 24×106	 24×108	
  10	6.5	 24×106	 24×108	
  14	7.5	 17×106	 17×108	
  20	8	 16×106	 16×108	
  40	7	 14×106	 14×108	
  60	5.5	 16×106	 16×108	
100	4	 20×106	 20×108	
200	3.5	 19×106	 19×108	
300	3.5	 16×106	 16×108	
400	3.5	 14×106	 14×108	
10	Value of quality factor (Q) at the point where the dose equivalent is maximum in a 30-centimeter diameter cylinder tissue-equivalent phantom.
11	Monoenergetic neutrons incident normally on a 30-centimeter diameter cylinder tissue-equivalent phantom.
1.14.5	Units of activity.
For purposes of these regulations, activity is expressed in the SI unit of becquerel (Bq) or in the special unit of curie (Ci), or their multiples, or disintegrations or transformations per unit of time.
1.14.5.1	One becquerel (Bq) = 1 disintegration per second or transformation per second (dps or s-1).
1.14.5.2	One curie (Ci) = 3.7×1010 disintegrations per second or transformations per second (dps or s-1) = 3.7×1010 becquerel (Bq) = 2.22×1012 disintegrations per minute (dpm).