Radon-222 and Radon-220 (thoron) Measurement and Action Level

["Redmond, Randy (RXQ) " <RXQ@Y12.doe.gov>]

I need a sanity check from the radon experts.  If I place track etch

detectors in my facility to measure radon-222, the radon-220 (thoron) will

also be detected and included in my total radon measurement.  

-  Does the EPA action level of  4 picocuries per liter also apply to the

radon-220?

-  Any situations where the radon-220 contribution should be separately

considered?



Randy Redmond

BWXT Y-12 L.L.C.

Y-12 National Security Complex

Radiological Control Organization

Email:  rxq@Y12.doe.gov

Phone:  865-574-5640

Fax:  865-574-0117



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