A preliminary comparison has been made between radon in drinking water and the incidence of cancer using 1278 home occupants in Virginia and Maryland who lived in their present home for at least 5 years. In this study group, the incidence of cancer (all types taken together) is 5.1% among people who consume high-radon well water (2,500-25,000 pCi/l) , 3-7% among people who consume municipal water (less than 100 pCi/l) , and 2.0% among people who consume low-radon well water (100-2,500 pCi/l). In the study area, where the average indoor radon is about 3 pCi/l and only about 10 % of the peculation use high-radon water well's, the incidence of cancer related to drinking water is five tiroes the total cancer risk frm indoor radon. The biological significance of radon is related to the fact that rado
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