In determining the dose from airborne radioactive material, the licensee shall include the contribution to the deep-dose equivalent, lens-dose equivalent, and shallow-dose equivalent from external exposure to the radioactive cloud (see Schedule RHS 8-30 footnotes 1 and 2). (Note: Airborne radioactivity measurements and DAC values should not be used as the primary means to assess the deep-dose 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 should be based upon measurements using instruments or individual monitoring devices.) 1 An organ or tissue is considered significantly irradiated if the product of the weighting factors, WT, and the committed dose equivalent, HT50, per unit intake for that organ or tissue is greater than 10 percent of the maximum weighted value of HT50 (i.e., WTHT50) per unit intake for any organ or tissue.

Authority: T.C.A. §§ 4-5-201, et seq., and 68-202-101, et seq. Administrative History: Original rule filed February 22, 2012; effective May 22, 2012.