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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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