Section 0400-20-05-.51 - COMPLIANCE WITH REQUIREMENTS FOR SUMMATION OF EXTERNAL AND INTERNAL DOSES(1) If the licensee is required to monitor under subparagraphs (1)(a) and (b) of Rule 0400-20-05-.71, the licensee shall demonstrate compliance with the dose limits by summing external and internal doses. If the licensee or registrant is required to monitor only under subparagraph (1)(a) of Rule 0400-20-05-.71 or only under subparagraph (1)(b) of Rule 0400-20-05-.71 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 by meeting one of the conditions specified in paragraph (2) of this rule and the conditions in paragraphs (3) and (4) of this rule. (Note: 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.)
(2) Intake by inhalation. 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: (a) The sum of the fractions of the inhalation ALI for each radionuclide; or(b) The total number of derived air concentration-hours (DAC-hours) for all radionuclides divided by 2,000; or(c) The sum of the calculated committed effective dose equivalents to all significantly irradiated organs or tissues (T)1 where the organ dose is expressed as a fraction of the annual limit. This sum shall be calculated from bioassay data using appropriate biological models.(3) Intake by oral ingestion. The licensee shall account for oral ingestion of radionuclides and include it in demonstrating compliance with the limits when: (a) The occupationally exposed individual intakes radionuclides by ingestion; and(b) The oral ingestion exceeds 10 percent of the applicable oral ALI.(4) Intake through wounds or absorption through skin. The licensee shall evaluate and, to the extent practical, account for intakes through wounds or skin absorption. (Note: The intake through intact skin has been included in the calculation of DAC for hydrogen-3 and does not need to be further evaluated.)
Tenn. Comp. R. & Regs. 0400-20-05-.51
Original rule filed February 22, 2012; effective May 22, 2012.Authority: T.C.A. §§ 68-202-201 et seq., and 4-5-201 et seq.