[Code of Federal Regulations]
[Title 10, Volume 1]
[Revised as of January 1, 2005]
From the U.S. Government Printing Office via GPO Access
[CITE: 10CFR36.57]

[Page 620]
 
                            TITLE 10--ENERGY
 
                CHAPTER I--NUCLEAR REGULATORY COMMISSION
 
PART 36_LICENSES AND RADIATION SAFETY REQUIREMENTS FOR IRRADIATORS
--Table of Contents
 
                   Subpart D_Operation of Irradiators
 
Sec. 36.57  Radiation surveys.

    (a) A radiation survey of the area outside the shielding of the 
radiation room of a panoramic irradiator must be conducted with the 
sources in the exposed position before the facility starts to operate. A 
radiation survey of the area above the pool of pool irradiators must be 
conducted after the sources are loaded but before the facility starts to 
operate. Additional radiation surveys of the shielding must be performed 
at intervals not to exceed 3 years and before resuming operation after 
addition of new sources or any modification to the radiation room 
shielding or structure that might increase dose rates.
    (b) If the radiation levels specified in Sec. 36.25 are exceeded, 
the facility must be modified to comply with the requirements in Sec. 
36.25.
    (c) Portable radiation survey meters must be calibrated at least 
annually to an accuracy of 20 percent for the 
gamma energy of the sources in use. The calibration must be done at two 
points on each scale or, for digital instruments, at one point per 
decade over the range that will be used. Portable radiation survey 
meters must be of a type that does not saturate and read zero at high 
radiation dose rates.
    (d) Water from the irradiator pool, other potentially contaminated 
liquids, and sediments from pool vacuuming must be monitored for 
radioactive contamination before release to unrestricted areas. 
Radioactive concentrations must not exceed those specified in 10 CFR 
part 20, table 2, column 2 or table 3 of appendix B, ``Annual Limits on 
Intake (ALIs) and Derived Air Concentrations (DACs) of Radionuclides for 
Occupational Exposure; Effluent Concentrations; Concentrations for 
Release to Sewerage.''
    (e) Before releasing resins for unrestricted use, they must be 
monitored before release in an area with a background level less than 
0.5 microsievert (0.05 millirem) per hour. The resins may be released 
only if the survey does not detect radiation levels above background 
radiation levels. The survey meter used must be capable of detecting 
radiation levels of 0.5 microsievert (0.05 millirem) per hour.