Re: Decay-In-Storage

[Bob Wilson <bmwils2@pop.uky.edu>]

william,

while it dosen't answer your question, the long-ago reason I was given (via
Oak Ridge, AEC or PHS) is that a storage period of ten half-lives would
allow the activity to reduce to less than 0.1 percent of the original. 

Bob


At 09:31 AM 4/19/00 -0500, you wrote:
>          A related question I have asked before and not had answered is why 
>          is it 10 half-lives?  Why not 8 or 12?
>          
>          Does anyone know how this "standard" decay time was determined?
>          
>          William A. Lorenzen
>          Children's Hospital
>          Boston, MA 02115
>          
>          lorenzen_w@a1.tch.harvard.edu
>          
>           
>
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Bob Wilson, Director
Radiation Safety Office
University of Kentucky
102 Animal Pathology
Lexington, KY  40546-0076
W:	859-323-6308
FAX:	859-323-4752
bmwils2@pop.uky.edu
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bobwilson@kih.net
http://www.uky.edu/FiscalAffairs/Environmental/radiation/
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