|(a) Licensees shall, when determining the dose from airborne
radioactive material, include the contribution to the deep-dose equivalent,
lens dose equivalent, and shallow-dose equivalent from external exposure to
the radioactive cloud. See notes 1 and 2 of §336.359, Appendix B, of
this title (relating to Annual Limits on Intake (ALI) and Derived Air Concentrations
(DAC) of Radionuclides for Occupational Exposure; Effluent Concentrations;
Concentrations for Release to Sanitary Sewerage).
(b) Airborne radioactivity measurements and DAC values shall
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 shall be based
upon measurements using instruments or individual monitoring devices.