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RE: Cr-51 counting

I don't know if anyone answered your question on Cr-51 counting but we do
use a lot of this gamma isotope (320 KeV, 9.8 %) and the best way to count
any smear or samples is the gamma (well) counter . As far as practical
issues (contamination monitoring after experiement), we do also use a
NaI/PVT portable counter that works with efficiencies of at least 20 %. I
never tested Cr-51 in a LSC counter but I'm sure you would be able to detect
something but not as much as the well counter.

Gestion des Risques/Risk Management
) stephane_jeanfrancois@merck.com
% (514) 428.8695
FAX: (514) 428.4917

> ----------
> From: 	Knapp, Timothy M.
> Sent: 	Tuesday, April 28, 1998 10:43 AM
> To: 	Multiple recipients of list
> Subject: 	Cr-51 counting
> Greetings all,
> Looking for opinions on the "best" way to detect Cr-51 on smears and as a
> liquid sample, both with handheld instruments and bench top instruments
> (LSC
> and Gamma counter)? I'm looking, specifically, for any thoughts on self
> attenuation within these types of samples and how that may affect
> counting.
> Any input would be appreciated.
> Standard disclaimers as usual
> Thanks
> Tim Knapp