^§ 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 
are: 
  (1) unavailable; 
  (2) inadequate; or 
  (3) internal dose estimates based on representative air concentration 
values are demonstrated to be as or more accurate. 




vSubpart D-[Reserved]