[ RadSafe ] Infinite Thickness of KCl

franz.schoenhofer at chello.at franz.schoenhofer at chello.at
Tue Aug 30 13:17:03 CDT 2011


Please consider the gamma-energy of K-40 - for me it is not really surprising. Don't forget the relatively high energetic betas. Maybe they might give rise to additional electrons? 
I would recommend that you measure directly the gammas if you want to know the infinite thickness for gamma emission......

Best regards,


---- Nielsen.Erik at epamail.epa.gov schrieb:
> 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
> "Those who do not read are no better off than those who cannot"
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Franz Schoenhofer, PhD, MinRat
Habicherg. 31/7
A-1160 Vienna
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