Self-shielding in air particulate samples

[Joel Cehn <jcehn@worldnet.att.net>]

Heavily loaded air filters will exhibit self-shielding, when counted for 
alpha, or soft betas.  What techniques are used to correct for this?  
The commercial labs that I have contacted usually don't correct for it, 
since they are only looking for "gross counts."  Has anyone seen a 
theoretical treatment of this correction?

Joel I. Cehn, CHP
JCehn@att.net

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