[ RadSafe ] Counting Efficiencies for Helgeson (Neutron Products)Whole Body Counter

Bob Hearn rhearn at bellsouth.net
Mon May 23 22:54:50 CDT 2011

I expect you are looking for the relationship between countrate and
activity. Is this the "lead coffin" with the traversing 4"x4"x16" NaI
crystal? Unless someone replies with other parameters, your best bet is to
get a phantom and some sources and calibrate that thing in the manner in
which you intend to use it!

Bob Hearn

----- Original Message ----- 
From: "James Barnes" <james.g.barnes at att.net>
To: "The International Radiation Protection (Health Physics) Mailing List"
<radsafe at health.phys.iit.edu>
Sent: Monday, May 23, 2011 8:55 PM
Subject: [ RadSafe ] Counting Efficiencies for Helgeson (Neutron
Products)Whole Body Counter


I need the approximate efficiencies for the Helgeson (now Neutron Products)
whole body counter (the "trough" version where the person laid down inside
the lead lined well and the counter trolly rolled above him / her)).
Particularly I need it for I-131, Cs-134, Cs-137. I looked in our old
reports, but efficiencies weren't really listed.

Any help (even educated guesstimates) would be useful.


Jim Barnes
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