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Abstract
The relationship between average indoor levels of radon and lung cancer mortality in the counties of Cornwall and Devon, England, are investigated. The associations of population density, social-class distribution, and regional smoking prevalence with lung cancer mortality in the local-authority districts of England and Wales were estimated by regression analysis. Low rates of lung cancer in Cornwall and Devon were predicted from the relationship. The differences between observed and predicted mortality in Cornwall and Devon districts were compared with average indoor levels of radon, which varied considerably between districts. Residual variations in lung cancer mortality were not significantly correlated with average indoor radon measurements. The current advice of the National Radiological Protection Board to government is to concentrate radon measurements, remedial action, and preventive action principally on Cornwall and Devon, but cross-sectional geographical data do not support the hypothesis that raised levels of radon indoors in southwest England have an important effect on lung cancer mortality.
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