6 Colo. Code Regs. § 1007-1-4.10

Current through Register Vol. 47, No. 11, June 10, 2024

Section 6 CCR 1007-1-4.10 - Determination of Prior Occupational Dose

4.10.1 For each individual who is likely to receive, in a year, an occupational dose requiring monitoring pursuant to 4.18, the licensee or registrant shall determine the occupational radiation dose received during the current year.

4.10.2 Prior to permitting an individual to participate in a planned special exposure, the licensee or registrant shall determine:

4.10.2.1 The internal and external doses from all previous planned special exposures; and

4.10.2.2 All doses in excess of the limits, including doses received during accidents and emergencies, received during the lifetime of the individual.

4.10.3 In complying with the requirements of 4.10.1 or 4.10.2, a licensee or registrant may:

4.10.3.1 Accept, as a record of the occupational dose that the individual received during the current year, a written signed statement from the individual, or from the individual's most recent employer for work involving radiation exposure, that discloses the nature and the amount of any occupational dose that the individual received during the current year; and

4.10.3.2 Accept, as the record of cumulative radiation dose, an up-to-date Department Form R-16, Cumulative Occupational Exposure History, or equivalent, signed by the individual and countersigned by an appropriate official of the most recent employer for work involving radiation exposure, or the individual's current employer, if the individual is not employed by the licensee or registrant; and

4.10.3.3 Obtain reports of the individual's dose equivalent from the most recent employer for work involving radiation exposure, or the individual's current employer, if the individual is not employed by the licensee or registrant, by telephone, telegram, facsimile, or letter. The licensee or registrant shall request a written verification of the dose data if the authenticity of the transmitted report cannot be established.

4.10.4 Record of Exposure History.

4.10.4.1 The licensee or registrant shall record the exposure history, as required by 4.10.1 or 4.10.2, on Department Form R-16, or other clear and legible record, of all the information required on that form. The form or record shall show each period in which the individual received occupational exposure to radiation or radioactive material and shall be signed by the individual who received the exposure. For each period for which the licensee or registrant obtains reports, the licensee or registrant shall use the dose shown in the report in preparing Department Form R-16 or equivalent. For any period in which the licensee or registrant does not obtain a report, the licensee or registrant shall place a notation on Department Form R-16 or equivalent indicating the periods of time for which data are not available.

4.10.4.2 Licensees or registrants are not required to reevaluate the separate external dose equivalents and internal committed dose equivalents or intakes of radionuclides assessed pursuant to the Regulations in Part 4 in effect before January 1, 1994. Further, occupational exposure histories obtained and recorded before January 1, 1994 on Department Form R-16 or equivalent, would not have included effective dose equivalent, but may be used in the absence of specific information on the intake of radionuclides by the individual.

4.10.5 If the licensee or registrant is unable to obtain a complete record of an individual's current and previously accumulated occupational dose, the licensee or registrant shall assume:

4.10.5.1 In establishing administrative controls pursuant to 4.6.6 for the current year, that the allowable dose limit for the individual is reduced by 12.5 mSv (1.25 rem) for each quarter for which records were unavailable and the individual was engaged in activities that could have resulted in occupational radiation exposure; and

4.10.5.2 That the individual is not available for planned special exposures.

4.10.6 The licensee or registrant shall retain the records on Department Form R-16 or equivalent until the Department terminates each pertinent license or registration requiring this record. The licensee or registrant shall retain records used in preparing Department Form R-16 or equivalent for 3 years after the record is made.

6 CCR 1007-1-4.10

Colorado Register, Vol 37, No. 14. July 25, 2014, effective 8/14/2014

38 CR 02, January 25, 2015, effective 2/14/2015

38 CR 05, March 10, 2015, effective 3/30/2015

38 CR 12, June 25, 2015, effective 7/15/2015

38 CR 14, July 25, 2015, effective 8/14/2015

39 CR 02, January 25, 2016, effective 2/14/2016

39 CR 16, August 25, 2016, effective 9/14/2016

39 CR 22, November 25, 2016, effective 12/15/2016

40 CR 11, June 10, 2017, effective 6/30/2017

40 CR 20, October 25, 2017, effective 11/14/2017

42 CR 24, December 25, 2019, effective 1/14/2020

43 CR 14, July 25, 2020, effective 8/14/2020

43 CR 18, September 25, 2020, effective 10/15/2020

44 CR 11, June 10, 2021, effective 7/15/2021

44 CR 14, July 25, 2021, effective 8/14/2021

45 CR 22, November 25, 2022, effective 12/15/2022

46 CR 21, November 10, 2023, effective 12/15/2023