Source of regs/policy on decay in storage

[ATMBY@aol.com]

Does anyone know the source of the often used limit for decay and storage of 
radioactive materials not exceeding a half life of 65 days?  Licensees are 
having a difficult time in getting rid of old cobalt 57 dose calibrator 
reference sources if the manufacturer will not take them back in exchange by 
new sources.  One choice being used is to hold these sources for "storage 
only" until they have reached exempt limits.  Any suggestions?



Thanks in advance,

Stephen A. Doerfler
************************************************************************
The RADSAFE Frequently Asked Questions list, archives and subscription
information can be accessed at http://www.ehs.uiuc.edu/~rad/radsafe.html