Re: Fe-55

["schoenho" <schoenho@via.at>]

Schoenhofer
Habichergasse 31/7
A-1160 Wien
AUSTRIA
Tel./Fax: +43-1-4955308
Mobiltel.: +43-664-3380333
e-mail: schoenho@via.at

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> Von: Al Castellane <castella@ohsu.edu>
> An: Multiple recipients of list <radsafe@romulus.ehs.uiuc.edu>
> Betreff: Fe-55
> Datum: Dienstag, 19. August 1997 20:12
> 
> 
> We have a researcher that is going to start using Fe-55 for some
transport
> assays. I am not very familiar with this nuclide and was hoping I could
get some
> specifics on it. The Rad Health Handbook states "Mn x-rays, continuous
> bremsstrahlung to 0.23" MeV (occuring at 0.004%).
> How would one detect this. Gamma spec, LSC? Could you use a NaI or G-M
survey
> instrument in the lab to survey? Any help would be greatly appreciated.
> 
> Thanks in advance for your help.
> 
> Al Castellane
> Oregon Health Sciences University
> castella@ohsu.edu
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Because of  the low beta energy of Fe-55 I only know about LSC methods for
determination - which does not necessarily mean, that there are no others
possible. Windowless gas counters with the sample to be measured in a
prepared form under the counter may be used for instance. To check for
contamination I can only imagine smear samples and LSC measurements. But be
very careful: Chemiluminescence may occur and mislead you to suspect high
contamination. We have such experience, but we can distinguish with our
Quantulus counters chemiluminescence from "real" counts.

Franz  

Franz