RE: I-131 MDA in vivo

[Chris Alston <alstonc@odrge.odr.georgetown.edu>]

Assuming that you're using a 2x2" NaI probe, in an ANSI clinical setup (of
which I cannot for the life of me find the number or title), your absolute
efficiency might be ~1700 cpm/uCi. Let's further assume that your
background, for a one-minute count, is 49 counts. A one-minute count would
then give you an MDA of 0.019 uCi (19 nCi), using the methodology of HASL-300.

Regards
cja
alstoncj@georgetown.edu


>-----Original Message-----
>From: Brian Rees [mailto:brees@lanl.gov]
>
>What is a reasonable MDA for I-131 in vivo?  I KNOW that you can detect
>lower levels with longer count times and shielding setups, I'm looking for
>a reasonable value for a clinical setup (maybe a field setup too).
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