180 Neb. Admin. Code, ch. 4, § 022

Current through September 17, 2024

Section 180-4-022 - CONDITIONS REQUIRING INDIVIDUAL MONITORING OF EXTERNAL AND INTERNAL OCCUPATIONAL DOSE

Each licensee or registrant must monitor exposures to radiation and radioactive material at levels sufficient to demonstrate compliance with the occupational dose limits of 180 NAC 4 as follows.

022.01OCCUPATIONAL EXPOSURE MONITORING. Each licensee or registrant must monitor occupational exposures to radiation from registered, licensed and unlicensed radiation sources under the control of the licensee or registrant and must supply and require the use of individual monitoring devices by:

(A) Adults likely to receive, in one year from sources external to the body, a dose in excess of 10% of the limits in 180 NAC 4-005.01; and

(B) Minors likely to receive, in one year, from sources external to the body, a deep dose equivalent in excess of 1 mSv ( 0.1 rem), a lens dose equivalent in excess of 1.5 mSv ( 0.15 rem), or a shallow dose equivalent to the skin or to the extremities in excess of 5 mSv ( 0.5 rem);

(C) Declared pregnant women likely to receive during the entire pregnancy, from radiation sources external to the body, a deep dose equivalent in excess of 1 mSv ( 0.1 rem). All of the occupational doses in 180 NAC 4-005 continue to be applicable to the declared pregnant worker as long as the embryo/fetus dose limit is not exceeded;

(D) Individuals entering a high or very high radiation area; and

(E) Individuals working with medical fluoroscopic equipment:

(i) An individual monitoring device used for the dose to an embryo/fetus of a declared pregnant woman, according to 180 NAC 4-012.01, must be located under the protective apron at the waist;

(ii) An individual monitoring device used for lens dose equivalent must be located at the neck or collar, or an unshielded location closer to the eye, outside the protective apron; and

(iii) When only one individual monitoring device is used to determine the effective dose equivalent for external radiation according to 180 NAC 4-005.03, it must be located at the neck or collar outside the protective apron. When a second individual monitoring device is used for the same purpose, it must be located under the protective apron at the waist. The second individual monitoring device is required for a declared pregnant woman.

022.02OCCUPATIONAL INTAKE OF RADIOACTIVE MATERIAL. Each licensee or registrant must monitor, to determine compliance with 180 NAC 4-008, the occupational intake of radioactive material by and assess the committed effective dose equivalent to:

(A) Adults likely to receive, in one year, an intake in excess of 10% of the applicable annual limit on intake (ALI) in Table I, Columns 1 and 2, of Appendix of 180 NAC 4;

(B) Minors likely to receive, in one year, a committed effective dose equivalent in excess of 1 mSv ( 0.1 rem); and

(C) Declared pregnant women likely to receive, during the entire pregnancy, a committed effective dose equivalent in excess of 1 mSv ( 0.1 rem).

180 Neb. Admin. Code, ch. 4, § 022

Amended effective 6/7/2021