South Carolina Code of Regulations
Chapter 61 - DEPARTMENT OF HEALTH AND ENVIRONMENTAL CONTROL
Subchapter 61-63 - Radioactive Materials (Title A)
Part III - STANDARDS FOR PROTECTION AGAINST RADIATION
Section 61-63.III.RHA 3.8 - Determination of Internal Exposure
Current through Register Vol. 48, No. 9, September 27, 2024
3.8.1 For purposes of assessing dose used to determine compliance with occupational dose equivalent limits, the licensee shall, when required under RHA 3.17, take suitable and timely measurements of--
3.8.2 Unless respiratory protective equipment is used, as provided in 3.19.3, or the assessment of intake is based on bioassays, the licensee shall assume that an individual inhales radioactive material at the airborne concentration in which the individual is present.
3.8.3 When specific information on the physical and biochemical properties of the radionuclides taken into the body or the behavior or the material in an individual is known, the licensee may--
3.8.4 If the licensee chooses to assess intakes of Class Y material using the measurements given in 3.8.1.2 or 3.8.1.3, the licensee may delay the recording and reporting of the assessments for periods up to 7 months, unless otherwise required by RHA 3.45 or RHA 3.46, in order to permit the licensee to make additional measurements basic to the assessments.
3.8.5 If the identity and concentration of each radionuclide in a mixture are known, the fraction of the DAC applicable to the mixture for use in calculating DAC-hours must be either--
3.8.6 If the identity of each radionuclide in a mixture is known, but the concentration of one or more of the radionuclides in the mixture is not known, the DAC for the mixture must be the most restrictive DAC of any radionuclide in the mixture.
3.8.7 When a mixture of radionuclides in air exists, licensees may disregard certain radionuclides in the mixture if--
3.8.8 In order to calculate the committed effective dose equivalent, the licensee may assume that the inhalation of one ALI, or an exposure of 2,000 DAC-hours, results in a committed effective dose equivalent of 5 rems (0.05 Sv) for radionuclides that have their ALIs or DACs based on the committed effective dose equivalent.
3.8.9 When the ALI (and the associated DAC) is determined by the nonstochastic organ dose limit of 50 rems (0.5 Sv), the intake of radionuclides that would result in a committed effective dose equivalent of 5 rems (0.05 Sv) (the stochastic ALI) is listed in parentheses in Table 1 of Appendix B, RHA 3.53. In this case, the licensee may, as a simplifying assumption, use the stochastic ALIs to determine committed effective dose equivalent. However, if the licensee uses the stochastic ALIs, the licensee must also demonstrate that the limit in 3.5.1.1.2 is met.
