4731 RADIATION SAFETY

4731.2070 OCCUPATIONAL DOSE LIMITS FOR MINORS. The annual occupational dose limits for minors are ten percent of the annual dose limits specified for adult workers under part 4731.2020. Statutory Authority: MS s 144.1202; 144.1203 History: 29 SR 755 Published Electronically: Marc…

4731.2080 DOSE EQUIVALENT TO EMBRYO/FETUS. Subpart 1. Dose limit. A licensee must ensure that the dose equivalent to an embryo/fetus during the entire pregnancy due to occupational exposure of a declared pregnant woman does not exceed 0.5 rem (5 mSv). Records must be kept accordi…

4731.2090 RADIATION DOSE LIMITS FOR THE PUBLIC. Subpart 1. Dose limits. A licensee must conduct operations so that: A. the total effective dose equivalent to individual members of the public from the licensed operation does not exceed 0.1 rem (1 mSv) in a year, exclusive of the d…

4731.2095 COMPLIANCE; DOSE LIMITS FOR THE PUBLIC. Subpart 1. Surveys required. A licensee must make or cause to be made, as appropriate, surveys of radiation levels in unrestricted and controlled areas and radioactive materials in effluents released to unrestricted and controlled…

4731.2100 RADIOLOGICAL CRITERIA FOR LICENSE TERMINATION. Subpart 1. General provisions and applicability. A. This part applies to the decommissioning of facilities licensed under this chapter and to facilities subject to the NRC's jurisdiction under the Atomic Energy Act of 1954,…

4731.2150 MINIMIZATION OF CONTAMINATION. A. Applicants for licenses, other than renewals, must describe in the application how facility design and procedures for operation will minimize, to the extent practicable, contamination of the facility and the environment, facilitate even…

4731.2200 SURVEYS AND MONITORING. Subpart 1. Required surveys. A licensee must make or cause to be made, surveys of areas, including the subsurface, that: A. may be necessary for the licensee to comply with this chapter; and B. are reasonable under the circumstances to evaluate: …

4731.2210 INDIVIDUAL MONITORING; EXTERNAL AND INTERNAL OCCUPATIONAL DOSE. Subpart 1. General requirement. A licensee must monitor exposures to radiation and radioactive material at levels sufficient to demonstrate compliance with the occupational dose limits of parts 4731.2000 to…

4731.2220 HIGH RADIATION AREAS; CONTROL OF ACCESS. Subpart 1. Entrance controls required. A. A licensee must ensure that each entrance or access point to a high radiation area has one or more of the following features: (1) a control device that, upon entry into the area, causes t…

4731.2230 VERY HIGH RADIATION AREAS; CONTROL OF ACCESS. In addition to the requirements under part 4731.2220, a licensee must institute additional measures to ensure that an individual is not able to gain unauthorized or inadvertent access to areas in which radiation levels could…

4731.2240 CONTROLLING CONCENTRATION OF RADIOACTIVE MATERIAL IN AIR. Subpart 1. Process or other engineering controls. A licensee must use, to the extent practical, process or other engineering controls, such as containment, decontamination, or ventilation, to control the concentr…

4731.2260 USE OF INDIVIDUAL RESPIRATORY PROTECTION EQUIPMENT. Subpart 1. Applicability. This part applies if a licensee assigns or permits the use of respiratory protection equipment to limit intake of radioactive material. Subp. 2. NIOSH certification. A licensee must use only r…

4731.2270 RESPIRATORY PROTECTION EQUIPMENT RESTRICTIONS. The commissioner may impose restrictions in addition to those under parts 4731.2240, 4731.2260, and 4731.2700 to: A. ensure that the respiratory protection program of the licensee is adequate to limit doses to individuals f…

4731.2280 USE OF HIGHER ASSIGNED PROTECTION FACTORS. A licensee must obtain authorization from the commissioner before using assigned protection factors in excess of those specified in part 4731.2700. The commissioner may authorize a licensee to use higher assigned protection fac…

4731.2290 STORAGE AND CONTROL OF LICENSED MATERIAL. Subpart 1. Security of stored material. A licensee must secure from unauthorized removal or access licensed materials that are stored in controlled or unrestricted areas. Subp. 2. Control of material not in storage. A licensee m…

4731.2300 CAUTION SIGNS. Subpart 1. Radiation symbol. Unless otherwise authorized by the commissioner, the standard radiation symbol used to designate a radiation hazard is as prescribed in this subpart. The radiation symbol is the three-bladed design: A. the cross-hatched area m…

4731.2310 POSTING REQUIREMENTS. Subpart 1. Radiation area. A licensee must post each radiation area with a conspicuous sign or signs bearing the radiation symbol and the words "CAUTION, RADIATION AREA." Subp. 2. High radiation area. A licensee must post each high radiation area w…

4731.2320 EXCEPTIONS TO POSTING REQUIREMENTS. Subpart 1. Short-term storage. A licensee is not required to post a caution sign in areas or rooms containing radioactive materials for periods of less than eight hours, if: A. the materials are constantly attended during these period…

4731.2330 LABELING CONTAINERS. Subpart 1. Label requirements. A licensee must ensure that each container of licensed material bears a durable, clearly visible label bearing the radiation symbol and the words "CAUTION, RADIOACTIVE MATERIAL" or "DANGER, RADIOACTIVE MATERIAL." The l…

4731.2340 LABELING REQUIREMENTS; EXEMPTIONS. A licensee is not required to label: A. containers holding licensed material in quantities less than the quantities listed in part 4731.2800; B. containers holding licensed material in concentrations less than those specified in part 4…

4731.2350 PROCEDURES FOR RECEIVING AND OPENING PACKAGES. Subpart 1. Package receipt. A licensee who expects to receive a package containing quantities of radioactive material in excess of a Type A quantity must make arrangements to receive: A. the package when the carrier offers …

4731.2360 LEAK TEST REQUIREMENTS. Subpart 1. Sealed sources. Except as otherwise required, sealed sources must be tested for leakage at intervals not to exceed the intervals specified in the certificate of registration issued by the NRC or an agreement state. Subp. 2. Sealed sour…

4731.2400 WASTE DISPOSAL. Subpart 1. General requirements. A licensee must dispose of licensed material only: A. by transfer to an authorized recipient as provided under parts 4731.0525 to 4731.0840, 4731.2450, and 4731.3000 to 4731.3175 or in Code of Federal Regulations, title 1…

4731.2405 DECAY-IN-STORAGE. Subpart 1. Disposal in ordinary trash. A licensee may hold radioactive material with half-lives of less than or equal to 120 days for decay-in-storage before disposal in ordinary trash if the licensee: A. monitors radioactive material at the surface be…

4731.2410 APPROVAL OF PROPOSED DISPOSAL PROCEDURES. A licensee or applicant for a license may apply to the commissioner for approval of proposed procedures, not otherwise authorized in this chapter, to dispose of licensed material generated in the licensee's or applicant's activi…

4731.2420 DISPOSAL BY RELEASE INTO SANITARY SEWERAGE. Subpart 1. Discharge limitations. A licensee may discharge licensed material into sanitary sewerage if: A. the material is readily soluble in water or is a biological material that readily disperses in water; B. the quantity o…

4731.2430 TREATMENT OR DISPOSAL BY INCINERATION. A licensee may treat or dispose of licensed material by incineration only: A. if the material is in a form and concentration specified in part 4731.2440; or B. as specifically approved by the commissioner according to part 4731.241…

4731.2440 DISPOSAL OF SPECIFIC WASTES. A. A licensee may dispose of the following licensed material as if it were not radioactive: (1) 0.05 microcurie (1.85 kBq) or less of hydrogen-3 or carbon-14 per gram of medium used for liquid scintillation counting; and (2) 0.05 microcurie …

4731.2450 TRANSFER FOR DISPOSAL; MANIFESTS. Subpart 1. Purpose. The requirements of this part and part 4731.2950 are designed to: A. control transfers of low-level radioactive waste by any waste generator, waste collector, or waste processor licensee who ships low-level waste dir…

4731.2460 DISPOSAL OF CERTAIN BYPRODUCT MATERIAL. Subpart 1. Disposal of licensed material. Licensed material as defined in part 4731.0100, subpart 32, items C and D, may be disposed of according to Code of Federal Regulations, title 10, part 61, even though it is not defined as …

4731.2500 RECORDS; RADIATION PROTECTION PROGRAMS. A. A licensee must maintain records of the radiation protection program, including: (1) the provisions of the program; and (2) audits and other reviews of the program content and implementation. B. A licensee must retain the recor…

4731.2510 RECORDS; SURVEYS. Subpart 1. Record maintenance; three years. A licensee must maintain records showing the results of surveys and calibrations required under parts 4731.2200 and 4731.2350, subpart 2, for three years after the record is made. The record must include: A. …

4731.2520 DETERMINATION OF PRIOR OCCUPATIONAL DOSE. Subpart 1. Determining occupational dose. For each individual who is likely to receive in a year an occupational dose requiring monitoring under part 4731.2210, a licensee must determine the occupational radiation dose received …

4731.2530 RECORDS; PLANNED SPECIAL EXPOSURES. Subpart 1. Required records. For each planned special exposure under part 4731.2060, a licensee must maintain records that describe: A. the exceptional circumstances requiring the use of a planned special exposure; B. the name of the …

4731.2540 RECORDS; INDIVIDUAL MONITORING RESULTS. Subpart 1. Required records. A licensee must maintain records of doses received by all individuals for whom monitoring is required under part 4731.2210 and records of doses received during planned special exposures, accidents, and…

4731.2550 RECORDS; DOSE TO INDIVIDUAL MEMBERS OF THE PUBLIC. A licensee must maintain records sufficient to demonstrate compliance with the dose limit for individual members of the public under part 4731.2090. A licensee must retain the records required under this part until the …

4731.2560 RECORDS; WASTE DISPOSAL. A. A licensee must maintain records of: (1) the disposal of licensed materials made under part 4731.2410, 4731.2420, 4731.2430, or 4731.2440; and (2) disposal by burial in soil, including burials authorized before January 28, 1981. B. A licensee…

4731.2600 REPORTS; THEFT OR LOSS OF LICENSED MATERIAL. Subpart 1. Telephone reports. A licensee must report to the commissioner by telephone, according to part 4731.0200, subpart 5, as follows: A. immediately after its occurrence becomes known to the licensee, any lost, stolen, o…

4731.2610 NOTIFICATION OF INCIDENTS. Subpart 1. Immediate notification required. Notwithstanding any other requirements for notification, a licensee must immediately report any event involving radioactive material possessed by the licensee that may have caused or threatens to cau…

4731.2620 REPORTS; RADIATION EXPOSURES, LEVELS, AND CONCENTRATIONS EXCEEDING CONSTRAINTS OR LIMITS. Subpart 1. Reportable events. In addition to the notification required under part 4731.2610, a licensee must submit a written report within 30 days after learning of: A. an inciden…

4731.2630 REPORTS; PLANNED SPECIAL EXPOSURES. A licensee must submit a written report to the commissioner within 30 days following any planned special exposure conducted according to part 4731.2060. The report must inform the commissioner that a planned special exposure was condu…

4731.2640 REPORTS TO INDIVIDUALS; DOSE LIMITS EXCEEDED. When a licensee is required, under part 4731.2620 or 4731.2630 to report to the commissioner any exposure of an identified occupationally exposed individual or an identified member of the public to radiation or radioactive m…

4731.2650 [Repealed, 40 SR 145] Published Electronically: August 27, 2015

4731.2700 ASSIGNED PROTECTION FACTORS FOR RESPIRATORS. Subpart 1. Applicability. A. The assigned protection factors in subpart 2 apply only in a respiratory protection program that meets the requirements of this chapter. They are applicable only to airborne radiological hazards a…

4731.2705 NATIONAL SOURCE TRACKING TRANSACTION REPORTING. Subpart 1. Report required. Each licensee who manufactures, transfers, receives, disassembles, or disposes of a nationally tracked source must complete and submit a National Source Tracking Transaction Report as specified …

4731.2750 ANNUAL LIMITS ON INTAKE AND DERIVED AIR CONCENTRATIONS. Subpart 1. General explanation. For each radionuclide, subpart 7, Table 1, indicates the chemical form that is to be used for selecting the appropriate annual limit on intake (ALI) or derived air concentration (DAC…

4731.2800 QUANTITIES OF LICENSED MATERIAL REQUIRING LABELING. Subpart 1. Explanation. The quantities listed in subpart 3 were derived by taking one-tenth of the most restrictive ALI listed in part 4731.2750, subpart 7, Table 1, columns 1 and 2, rounding to the nearest factor of t…