[ RadSafe ] Infinite Thickness of KCl

Wasiolek, Maryla mwasiol at sandia.gov
Tue Aug 30 16:05:32 CDT 2011


You can use MicroShield software with infinite slab geometry.  The simple exponential formula won't quite work because it does not account for buildup and the fact that gammas are generated at various thicknesses throughout the source.

Maryla Wasiolek
Sandia National Labs

-----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 10:50 AM
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 

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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