National Institute of Environmental Health Sciences (NIEHS), Environmental Health Perspectives, 6(123), p. 622-628, 2015
DOI: 10.1289/ehp.1408548
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BACKGROUND Exposure to medium or high doses of ionizing radiation is a known risk factor for cancer in children. The extent to which low dose radiation from natural sources contributes to the risk of childhood cancer remains unclear. OBJECTIVES In a nationwide census-based cohort study, we investigated whether the incidence of childhood cancer was associated with background radiation from terrestrial gamma and cosmic rays. METHODS Children aged