§ 835.208 Limits for members of the public entering a controlled area.
§ 835.209 Concentrations of radioactive material in air.
(a) The derived air concentration (DAC) values given in appendices
A and C to this part shall be used in the control of occupational
exposures to airborne radioactive material.
(b) With regard to inhalation exposures and external exposures
from airborne radionuclides, compliance with this part shall
be demonstrated through conformity with § 835.101 and § 835.202
which establishes the applicable regulatory limits.
(c) The estimation of internal dose shall be based on bioassay
data rather than air concentration values unless bioassay data
(2) inadequate; or
(3) internal dose estimates based on representative air concentration
values are demonstrated to be as or more accurate.