U.S. Geological Survey - The Geology of Radon
High levels of indoor radon are found in every state. We know from medical and environmental studies that radon can be a health risk, primarily as a cause of lung cancer. Radon comes from the soil, rock, and water around us. Because levels of radon vary from place to place, and because houses differ in their vulnerability to radon, it is important that all homes be measured for radon. These pages present important geological information about radon; how it forms, the kinds of rocks and soils it comes from, and how it moves through the ground or is carried by water into buildings, and explains the way geologists estimate the radon potential of an area.
Radon gas, a radioactive product of uranium, can reach high levels in some houses, depending on the local geology and house construction.
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13 October 1995