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

[James Barnes]

Yes, you are correct.  Problem is that I am trying to work out a retrospective 
dose assessment with data that is in CPM from a "Helgeson-like" counter array.  
So what I need is a ballpark efficiency so I can get a back of the envelope 
conversion from CPM to activity,  then from activity to dose assessment.  
Doesn't have to be perfect, just relatively close.

Jim

 



________________________________
From: Bob Hearn <rhearn at bellsouth.net>
To: The International Radiation Protection (Health Physics) MailingList 
<radsafe at health.phys.iit.edu>
Sent: Mon, May 23, 2011 8:54:50 PM
Subject: Re: [ RadSafe ] Counting Efficiencies for Helgeson (Neutron 
Products)Whole Body Counter

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


Folks;

I need the approximate efficiencies for the Helgeson (now Neutron Products)
whole body counter (the "trough" version where the person laid down inside
of
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
Helgeson
reports, but efficiencies weren't really listed.

Any help (even educated guesstimates) would be useful.

Thanks,

Jim Barnes
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