RE: Decay-In-Storage

["Merkel, Jon R" <merkel@bnl.gov>]

William,

I would say that given the fact that after 7 half lives you are below 1% of
original activity that ten half lives would be undetectable and able to be
released with no concerns.



-----Original Message-----
From: William Lorenzen [mailto:LORENZEN_W@A1.TCH.Harvard.edu]
Sent: Wednesday, April 19, 2000 10:31 AM
To: Multiple recipients of list
Subject: Decay-In-Storage


          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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