Bureau of Radiol. Prot.
HEW
Parklawn Bldg
[stamped, AUG 7 1973]
are there published Standards of radiation exposure from this source?
maintenance and monitoring?
[stamped, BRH
Office of Information
'13 AUG 17 AM 10:11]
[stamped, AUG 31 1973]
(2)