Recent epidemiological studies of the association between lung
cancer and exposure to radon and its decay products are reviewed.
Particular emphasis is given to pooled case-control studies of
residential exposures and to cohorts of underground miners exposed
to relatively low levels of radon. The residential and miner
epidemiological studies provide consistent estimates of lung cancer
risk with statistically significant associations observed at
average annual concentrations of about 200 Bq m-3 and cumulative
occupational levels of about 50 WLM, respectively. Based on recent
results from combined analyses of epidemiological studies of
miners, a lifetime excess absolute risk of 5 x 10-4 per WLM (14 x
10-5 per mJ h m-3) should now be used as the nominal probability
coefficient for radon and radon progeny induced lung cancer,
replacing the previous ICRP Publication 65 value of 2.8 x 10-4 per
WLM (8 x 10-5 per mJ h m-3). Current knowledge of radon associated
risks for organs other than the lungs does not justify the
selection of a detriment coefficient different from the fatality
coefficient for radon-induced lung cancer.
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