Re: I-129 Sources

["Franz Schoenhofer" <franz.schoenhofer@chello.at>]

-----Ursprüngliche Nachricht-----
Von: Hohnadel, David ,PhD <hohnadel@acmlab.com>
An: Multiple recipients of list <radsafe@romulus.ehs.uiuc.edu>
Datum: Mittwoch, 10. Jänner 2001 21:32
Betreff: I-129 Sources


>

I seem
>to remember using an I-129 sealed source in a test-tube type container
>as a secondary standard.  The company
>I'm to obtain standard materials from currently only supplies I-125 as
>standards.


I do not know, what kind of measurement methods you use, but are you sure,
you remember I-129? It is a very long lived fission product (half life
1.57*10E7 years), emitting two low-energy conversion electrons and betas
with a maximum energy of 151.2 keV, which will not penetrate glass.
Determination at environmental levels is extremely difficult.

Franz


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