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

Howard howard.long at comcast.net
Mon May 23 22:09:37 CDT 2011

Lew Helgeson, who passed away recently, was a personal friend and patient.
His lead well was stored where I now live, and his assistant, Eagan, lived here.

As I recall, negligible radiation ( except neutrons) got through the lead bricks,
suggesting  near 100% "efficiency" for how much of detected radiation 
came from the person in the well.

Howard Long
On May 23, 2011, at 5:55 PM, James Barnes <james.g.barnes at att.net> wrote:

> 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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