Re[3]: Radon Question from Occ-Med-Env -Reply- inside mask conc

["Brian Rees" <brees@lanl.gov>]

If Rn progeny is removed by the filters, and only Rn gets into the mask, 
the progeny concentration inside the mask will be nowhere near the 
concentration outside.  The residence time inside the mask is too short for 
any appreciable buildup (assuming breathing activity). 

The progeny attachment to dust, and attachment of dust and progeny to 
filter media will lower the progeny concentration inside the mask by 
factors dependent on dust size, equilibrium conditions and numerous other 
environmental and physical factors.

The above opinions are mine alone, and have no bearing on my employer.

Brian Rees
Los Alamos National Lab
brees@lanl.gov