[ RadSafe ] Tritium Surface Contamination
mcnaught at lanl.gov
Wed Nov 4 12:48:29 CST 2009
I have two questions about measurements of tritium surface
contamination. At US DOE sites, it is common to take 100 cm2 smears
of a surface suspected of tritium contamination, count the smears
(with liquid scintillator), and report the results as dpm/100 cm2.
The data are then compared with the DOE criterion of 10,000 dpm/100
cm2 for tritium. However, even if you clean the surface thoroughly,
tritium diffuses from beneath the surface and re-contaminates the
surface, so what you count on the smear is not all there is.
1. Are such measurements used at non-DOE sites (e.g., in Canada)?
2. Is there any way to relate these measurements to volume
contamination (e.g., units of dpm/g) or to the total amount of
tritium in the object?
Los Alamos National Lab.
email: mcnaught at LANL.gov or mcnaughton at LANL.gov
phone: 505-667-6130; page: 505-664-7733
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