Radon is a colorless, odorless, naturally occurring, radioactive gas. Humans are primarily exposed to this health hazard by breathing indoor air containing radon, which enters man-made structures primarily by leakage of soil gas through building foundations (Field, 1999). Numerous public health agencies consider residential radon exposure to be the second leading cause of lung cancer after cigarette smoking (U.S. EPA, 2003; Field, 1999), resulting in an estimated 21,000 deaths annually in the United States (U.S. EPA, 2003). The U.S. EPA (1993) has established 4 picocuries per liter (pCi/L) of radon as the federal...
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