[ RadSafe ] short half life

[SShafer1 at aol.com]

I have seen  both 90 days and 120 days spelled out as short lived isotopes on 
NRC and  Agreement State Licenses. Also I have seen facility specific 
examples  in procedures.  Back in the moratorium days on DOE sites I remembering  
auditing and seeing lists in procedures specifying short lived  radionuclides 
with ranges of 30 days to anything less than 1 year.  I  have also seen research 
facilities using any isotopes with a half-life less than  30 days (e.g my 
graduate school) but the radiopharmacy school at the same  university used a 
different list and they both operated under the same  license.  So from my 
experience it can be facility specific and  confusing.  


Stephen B. Shafer / Health  Physicist
Radiological & Environmental Management, LLC
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Algonquin, IL 60102

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