Air Sampling

["Knapp, Timothy M." <timothy_knapp@merck.com>]

Radsafers

We have air sampling systems with charcoal filters in series used to
determine the trapping efficiency of the systems.  Over the past year I have
run into 3 occasions where the counts in the second filter are almost equal
to those of the first.  We're only talking a few thousand counts so I have
ruled out saturation by the nuclide.  Nothing new was done procedurally and
as far as I can tell the temperature and humidity were the same as well.  Is
there a phenomena called tunneling that occurs in charcoal ?  If so can
someone explain or provide a reference?  If not can someone explain or
provide a reference?

Without an explanation or a reference
Tim K.


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Timothy M. Knapp
Merck Research Laboratories
PO Box 4, WP44C-2
West Point, PA 19486

Ph (215) 652-4648
Fx  (215) 652-3667
timothy_knapp@merck.com
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