[Code of Federal Regulations]
[Title 10, Volume 4, Parts 500 to end]
[Revised as of January 1, 2001]
From the U.S. Government Printing Office via GPO Access
[CITE: 10CFR835.209]

[Page 461]
 
                            TITLE 10--ENERGY
 
                    CHAPTER III--DEPARTMENT OF ENERGY
 
PART 835--OCCUPATIONAL RADIATION PROTECTION--Table of Contents
 
         Subpart C--Standards for Internal and External Exposure
 
Sec. 835.209  Concentrations of radioactive material in air.

    (a) The derived air concentration (DAC) values given in appendices A 
and C of this part shall be used in the control of occupational 
exposures to airborne radioactive material.
    (b) 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 air concentration values are 
demonstrated to be as or more accurate.

[58 FR 65485, Dec. 14, 1993, as amended at 63 FR 59682, Nov. 4, 1998]

Subpart D  [Reserved]