Re: Sealed sources

["Alan R. Marchand" <radarm@accessnv.com>]

Do not forget to look into what the isotope decays into.

Alan R. Marchand
radarm@accessnv.com


At 07:16 PM 12/9/97 -0600, you wrote:
>Stacey Alderson wrote:
>> 
>> Radsafers,
>> 
>> At what time does a short lived sealed source cease being
>> radioactive material.   Especially if the source has documenation
>> identifying it as radioactive material and it was allowed to decay in
>> storage.   If the source has decayed to undetectable levels can it
>> then be disposed of as nonrad material.
>> 
>> Stacey Alderson
>
>
>If I were making policy, I'd say, "After 10 half lives for all nuclides
>in the source (including those that are impurities in the primary
>nuclide) and if radiation from the source were less than 0.5 mrem per
>hour at two inches (I think that dose rate is what the FDA uses for TV
>machines) from any surface.  Al Tschaeche
>
>