180 Neb. Admin. Code, ch. 4, § 009

Current through September 17, 2024

Section 180-4-009 - DETERMINATION OF PRIOR OCCUPATIONAL DOSE

Prior occupational dose must be determined as follows.

009.01PRIOR OCCUPATIONAL DOSE. For each individual who may enter the licensee's or registrant's restricted area and is likely to receive, in a year, an occupational dose requiring monitoring according to 180 NAC 4-022, the licensee or registrant must:

(A) Determine the occupational radiation dose received during the current year; and

(B) Attempt to obtain the records of cumulative occupational radiation dose.

009.02PRIOR PLANNED SPECIAL EXPOSURE AND DOSES IN EXCESS OF THE LIMITS. Prior to permitting an individual to participate in a planned special exposure, the licensee or registrant must determine:

(A) The internal and external doses from all previous planned special exposures; and

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

009.03RECORDS OF PRIOR OCCUPATIONAL DOSE. In complying with the requirements of 180 NAC 4-009.01, a licensee or registrant may:

(A) 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;

(B) Accept, as the record of cumulative radiation dose, an up-to-date Department Form NRH-1, 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; or

(C) 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, electronic media, or letter. The licensee or registrant must request a written verification of the dose data if the authenticity of the transmitted report cannot be established.

009.04EXPOSURE HISTORY. The licensee or registrant must record the exposure history, as required by 180 NAC 4-009.01, on Department Form NRH-1, or other clear and legible record, including all of the information required on that form.

(A) The form or record must show each period in which the individual received occupational exposure to radiation or radioactive material and must be signed by the individual who received the exposure. For each period for which the licensee or registrant obtains reports, the licensee or registrant must use the dose shown in the report in preparing Department Form NRH-1 or equivalent. For any period in which the licensee or registrant does not obtain a report, the licensee or registrant must place a notation on Department Form NRH-1 indicating the periods of time for which data are not available.

(B) Licensees or registrants are not required to partition historical dose between external dose equivalent(s) and internal committed dose equivalent(s). Further, occupational exposure histories obtained and recorded on Department Form NRH-1 before the May 30, 1994, might not have included effective dose equivalent, but may be used in the absence of specific information on the intake of radionuclides by the individual.

009.05ASSUMPTIONS. 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 must assume:

(A) In establishing administrative controls under 180 NAC 4-005.06 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

(B) That the individual is not available for planned special exposures.

009.06RECORDS RETENTION. The licensee or registrant must retain the records on Department Form NRH-1 or equivalent until the Department terminates each pertinent license or registration requiring this record. The licensee or registrant must retain records used in preparing Department Form NRH-1 or equivalent for three years after the record is made. This includes records required under the standards for protection against radiation in effect prior to May 30, 1994.

180 Neb. Admin. Code, ch. 4, § 009

Amended effective 6/7/2021