Indoor Radon Measurements in the New York Capital District

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Abstract
222Rn concentrations were measured in 21 energy-efficient homes and 14 conventional homes in the New York Capital District. Usual concentrations were averaged over 6 or 12 mo. periods using solid-state track detectors. Full year averages were available for 23 homes, and the winter-to-summer variations were observed. In a number of cases, 222Rn emanations from various construction materials and soil samples had been measured and correlations sought with indoor 222Rn. Two major patterns emerged. The living areas of the energy-efficient homes without heat-storage masses had median Rn concentrations that were 1.6-fold those for conventional homes, and the energy-efficient homes with heat-storage masses had 4-5-fold the 222Rn of conventional homes.