HAR §11-45-40. Occupational dose limits for adults

(a) The licensee shall control the occupational dose to individual adults, §11-45-33 45-50 except for planned special exposures, to the following dose limits: (1) An annual limit, which is the more restrictive of: (A) The total effective dose equivalent being equal to five rems (0.05 sievert); or (B) The sum of the deep dose equivalent and the committed dose equivalent to any individual organ or tissue other than the lens of the eye being equal to fifty rems (0.50 sievert). (2) The annual limits to the lens of the eye, to the skin, and to the extremities which are: (A) An eye dose equivalent of fifteen rems (0.15 sievert), and (B) A shallow dose equivalent of fifty rems (0.50 sievert) to the skin or to any extremity. (b) Doses received in excess of the annual limits, including doses received during accidents, emergencies, and planned special exposures, shall be subtracted from the limits for planned special exposures that the individual may receive during the current year and during the individual's lifetime. (c) The assigned deep dose equivalent and shallow dose equivalent shall be for the portion of the body receiving the highest exposure determined as follows:. (1) The deep dose equivalent, eye dose equivalent and shallow dose equivalent may be assessed from surveys or other radiation measurements for the purpose of demonstrating compliance with the occupational dose limits, if the individual monitoring device was not in the region of highest potential exposure, or the results of individual monitoring are unavailable. (2) Reserved. (d) Derived air concentration (DAC) and annual limit on intake (ALI) values are presented in Table I of Appendix B and may be used to determine the individual's dose and to demonstrate compliance with the occupational dose limits. (e) Notwithstanding the annual dose limits, the licensee shall limit the soluble uranium intake by an individual to ten milligrams in a week in consideration of chemical toxicity. See footnote 3 of Appendix B. (f) The licensee shall reduce the dose that an individual may be allowed to receive in the current year by the amount of occupational dose received while employed by any other person. (g) Appendix B to Part D of the Conference of Radiation Control Program Directors, Inc. Suggested State Regulations for Control of Radiation, Volume I, December 1995 Edition, entitled, "Annual Limits on Intake (ALI) and Derived Air Concentrations (DAC) of Radionuclides for Occupational Exposure; Effluent Concentrations; Concentrations for Release to Sanitary Sewerage", is made a part of this section and is available from the department. [Eff 11/12/99] (Auth: HRS §§321-10, 321-11, 321-71) (Imp: HRS §§321-1, 321-11(21), 321-71) §11-45-42 45-51 §11-45-41 Compliance with requirements for summation of external and internal doses. (a) If the licensee is required to monitor pursuant to section 11-45-54(a) and (b), the licensee shall demonstrate compliance with the dose limits by summing external and internal doses. If the licensee is required to monitor only pursuant to section 11-45-54(a) or only pursuant to section 11-45-54(b), then summation is not required to demonstrate compliance with the dose limits. The licensee may demonstrate compliance with the requirements for summation of external and internal doses pursuant to subsections (b), (c), and (d). The dose equivalents for the lens of the eye, the skin, and the extremities are not included in the summation, but are subject to separate limits. (b) If the only intake of radionuclides is by inhalation, the total effective dose equivalent limit is not exceeded if the sum of the deep dose equivalent divided by the total effective dose equivalent limit, and one of the following, does not exceed unity: (1) The sum of the fractions of the inhalation ALI for each radionuclide, or (2) The total number of derived air concentration-hours (DAC-hours) for all radionuclides divided by two thousand, or (3) The sum of the calculated committed effective dose equivalents to all significantly irradiated organs or tissues (T) calculated from bioassay data using appropriate biological models and expressed as a fraction of the annual limit. For purposes of this requirement, an organ or tissue is deemed to be significantly irradiated if, for that organ or tissue, the product of the weighting factors, wT, and the committed dose equivalent, HT,50, per unit intake is greater than ten percent of the maximum weighted value of H50, that is, wTHT,50, per unit intake for any organ or tissue. (c) If the occupationally exposed individual also receives an intake of radionuclides by oral ingestion greater than ten percent of the applicable oral ALI, the licensee shall account for this intake and include it in demonstrating compliance with the limits. (d) The licensee shall evaluate and, to the extent practical, account for intakes through wounds or skin absorption. [Eff 11/12/99] (Auth: HRS §§321-10, 321-11, 321-71) (Imp: HRS §§321-1, 321-11(21), 321-71) §11-45-42 Determination of external dose from airborne radioactive material. (a) Licensees shall, when determining the dose from airborne radioactive material, include the contribution to the deep dose equivalent, eye dose equivalent, and shallow dose equivalent from external exposure to the radioactive cloud. See Appendix B, footnotes 1 and 2. (b) Airborne radioactivity measurements and DAC values shall not be used as the primary means to assess the deep dose §11-45-42 45-52 equivalent when the airborne radioactive material includes radionuclides other than noble gases or if the cloud of airborne radioactive material is not relatively uniform. The determination of the deep dose equivalent to an individual shall be based upon measurements using instruments or individual monitoring devices. (c) Appendix B to Part D of the Conference of Radiation Control Program Directors, Inc. Suggested State Regulations for Control of Radiation, Volume I, December 1995 Edition, entitled, "Annual Limits on Intake (ALI) and Derived Air Concentrations (DAC) of Radionuclides for Occupational Exposure; Effluent Concentrations; Concentrations for Release to Sanitary Sewerage", is made a part of this section and is available from the department. [Eff 11/12/99] (Auth: HRS §§321-10, 321-11, 321-71) (Imp: HRS §§321-1, 321-11(21), 321-71)