Contribution of Childhood Indoor Radon Exposure to Lung Cancer Incidence among Young Adults: A Population-Based Ecological Study in Canada

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  • Chen Jing
    Radiation Protection Bureau, Health Canada, 775 Brookfield Road, Ottawa, K1A 1C1, Ontario, Canad
  • Xie Lin
    Centre for Surveillance and Applied Research, Public Health Agency Canada, 785 Carling Avenue, Ottawa K1A 0K9, Ontario, Canada

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Exposure to indoor radon has been determined to be the second leading cause of lung cancer after tobacco smoking. Recently, it was shown that approximately 90% of Canadiansʼ exposure to radon comes from time spent indoors. Because this exposure effectively begins at birth, long before even young teens begin to smoke, we hypothesized that cumulative exposure to indoor radon during childhood could be a major leading cause of lung cancer among young adults. The population-based analysis presented confirms that lung cancer incidence among young adults is significantly correlated to indoor radon concentrations. Even though only limited data among young adults are available for the analysis and the uncertainty can be very large, the result indicates nevertheless cumulative exposure to indoor radon during childhood can be a major leading cause of lung cancer among young adults. In later adult life, the lung cancer incidence rate could be more strongly correlated to smoking rates than to radon exposure.

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