RT Journal Article
SR Electronic
T1 Distribution of airborne radon-222 concentrations in U.S. homes
JF Science
JO Science
FD American Association for the Advancement of Science
SP 992
OP 997
DO 10.1126/science.3775373
VO 234
IS 4779
A1 Nero, AV
A1 Schwehr, MB
A1 Nazaroff, WW
A1 Revzan, KL
YR 1986
UL http://science.sciencemag.org/content/234/4779/992.abstract
AB Apparently large exposures of the general public to the radioactive decay products of radon-222 present in indoor air have led to systematical appraisal of monitoring data from U.S. single-family homes; several ways of aggregating data were used that take into account differences in sample selection and season of measurements. The resulting distribution of annual-average radon-222 concentrations can be characterized by an arithmetic mean of 1.5 picocurie per liter (55 becquerels per cubic meter) and a long tail with 1 to 3% of homes exceeding 8 picocuries per liter, or by a geometric mean of 0.9 picocurie per liter and a geometric standard deviation of about 2.8. The standard deviation in the means is 15%, estimated from the number and variability of the available data sets, but the total uncertainty is larger because these data may not be representative. Available dose-response data suggest that an average of 1.5 picocuries per liter contributes about 0.3% lifetime risk of lung cancer and that, in the million homes with the highest concentrations, where annual exposures approximate or exceed those received by underground uranium miners, long-term occupants suffer an added lifetime risk of at least 2%, reaching extraordinary values at the highest concentrations observed.