Abstract
The primary sources of indoor radon are analyzed and discussed. These include soil gas, building materials, and tap water. Within the framework of a simple steady-state analysis of the radon concentration in a model of a typical house, the potential contribution to indoor radon levels from each source is determined. When these results are compared with reported field studies of radon in houses, it appears that the infiltration of soil gas directly into a house is generally by far the largest contributor to indoor radon levels. In a few regions of the country, where drinking water supplies are drawn from aquifers in granite and other radium-bearing strata, water usage can be another major contributor to indoor radon. Even in well ventilated houses, with air exchange rates in excess of one house volume per hour, soil gas and water can lead to radon concentrations above existing health protection guides, such as those developed for remedial actions addressing the use of uranium mill tailings in houses. In ex...
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