Re: Radon Levels

["Otto G. Raabe" <ograabe@ucdavis.edu>]

June 15, 2000
Davis, CA

The working level month is defined at exposure for 168 hours, which is a
work month, to 100 pCi/L of radon-222 in equilibrium with its short-lived
decay products. The EPA assumes 50% equilibrium in homes so 4 pCi/L is
equivalent to 2 pCi/L at equilibrium. So from there all you need to know is
how many hours per month one is exposed to home air. If it happens to be
168 hours per month, 4 pCi/L of radon would yield 0.02 WLM in one month or
0.24 WLM per year.

Otto
	*****************************************************
	Prof. Otto G. Raabe, Ph.D., CHP
	Institute of Toxicology & Environmental Health (ITEH)
	(Street Address: Bldg. 3792, Old Davis Road)
	University of California, Davis, CA 95616
	E-Mail: ograabe@ucdavis.edu
	Phone:(530) 752-7754, FAX:(530) 758-6140
	*****************************************************
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