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INDOOR 222RN IN TENNESSEE VALLEY HOUSES: SEASONAL, BUILDING, AND GEOLOGICAL FACTORS
Citation:
Dudney, C., A. Hawthorne, D. Wilson, AND R. Gammage. INDOOR 222RN IN TENNESSEE VALLEY HOUSES: SEASONAL, BUILDING, AND GEOLOGICAL FACTORS. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-92/396.
Description:
The article discusses effects of seasonal, building, and geological factors on indoor radon-222 (Rn-222) in 312 occupied Tennessee Valley houses. wo-season surveys of 226 houses in Roane County, TN were conducted in 1985-86, and of 86 houses in Madison County, AL, in 1988-89. lpha track detectors were placed in each house for 3 months or more during the winter heating season. etectors were placed at the same sites during the following cooling season. n this study, comparisons were made between winter and summer sampling times and between building types. or the data from Madison County, additional comparisons were made between regions of the county that differed in geological characteristics, especially the thickness of the overburden above the Chattanooga Shale layer, a geological stratum that has high concentrations of radon-226 and is widely found in the southeastern U.S. The geometric means of summer and winter measurements in Roane County exceeded summer respectively. he winter Rn-222 concentrations in Roane County, the opposite was found: typically, concentrations were higher in the summer. ubstructure and other building factors had no observable effect on indoor Rn-222.