In the eastern half of the United States, below the limit of glaciation, bedrock geology accounts for a significant amount of the variation seen in indoor radon. Various geologic parameters as well as soil radon and surface gamma radiation have been compared with thousands of indoor radon measurements and regression analyses indicate high positive correlations (R>S to.9). In this part of the U.S., bedrock geologic models for indoor radon can be used successfully for prediction. Across the northern tier of states that have been subject to glaciation, the correlation of bedrock geology to indoor radon is obscured or is positive in only certain situations. In glaciated areas of the country, the type, composition, thickness, and permeability of glacial deposits play major roles in controlling radon sources in the soil. The contribution from water to indoor air and certain types of house architecture are also confounding factors in certain areas of (he United States
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