[ RadSafe ] Infinite Thickness of KCl

[Baumbaugh, Joel T CIV SPAWARSYSCEN-PACIFIC, 55360]

I was looking for much the same/similar information for depleted
uranium.  Does anyone have a reference for me (or just a number)?  I'm
thinking that it must be pretty thin...

Thanks,

Joel Baumbaugh
SSC-Pacific 

-----Original Message-----
From: radsafe-bounces at health.phys.iit.edu
[mailto:radsafe-bounces at health.phys.iit.edu] On Behalf Of Dixon, John E.
(CDC/ONDIEH/NCEH)
Sent: Tuesday, September 13, 2011 10:35 AM
To: The International Radiation Protection (Health Physics) Mailing List
Subject: Re: [ RadSafe ] Infinite Thickness of KCl

Erik,

This could be a candidate case for MicroShield. You could set the photon
energy for K-40 and alter the source thickness manually and then run the
program. This would take several iterations. For this case, I would not
use the transmission factor relationship since you are searching for the
thickness of source material which is going to emit gammas no matter
what the thickness. You just need to find the thickness where the
fluence appears not to change.

John Dixon

-----Original Message-----
From: radsafe-bounces at health.phys.iit.edu
[mailto:radsafe-bounces at health.phys.iit.edu] On Behalf Of
Nielsen.Erik at epamail.epa.gov
Sent: Tuesday, August 30, 2011 12:50 PM
To: radsafe at health.phys.iit.edu
Cc: liste de distribution pour les RADIOCHIMISTEs
Subject: [ RadSafe ] Infinite Thickness of KCl

I am trying to determine the infinite thickness of the 1460 keV gamma
emission (10.5% abundance) of a planar source of KCl (416 pCi/g) and a
density of 1.98 g/cc.

In other words, what is the thickness of a KCl planar source where any
additional thickness does not increase the surface dose rate?

I have scoured my references but have not located the appropriate
formula for calculating this value.

I would appreciate any references or suggestions for an appropriate
calculation.

Erik C. Nielsen
USEPA, National Air and Radiation Environmental Laboratory 540 South
Morris Ave.
Montgomery, AL 36115
Phone 334-270-3475
Fax 334-270-3454

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