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American Journal of Epidemiology Vol. 128, No. 6: 1266-1275
Copyright © 1988 by The Johns Hopkins University School of Hygiene and Public Health

research-article

CANCER MORTALITY AMONG A GROUP OF FLUORSPAR MINERS EXPOSED TO RADON PROGENY1

HOWARD I. MORRISON, ROBERT M. SEMENCIW, YANG MAO and DONALD T. WIGLE

Morrison, H. I. (Laboratory Centre for Disease Control, Ottawa, Ontario, Canada K1A 0L2), R. M. Semenciw, Y. Mao, and D. T. Wigle. Cancer mortality among a group of fluorspar miners exposed to radon progeny. Am J Epidemiol 1988; 128:1266–75.

A cohort study of the mortality experience (1950–1984) of 1,772 Newfoundland underground fluorspar miners occupationally exposed to high levels of radon daughters (mean dose = 382.8 working levels months) has been conducted. Observed numbers of cancers of the lung, salivary gland, and buccal cavity and pharynx were significantly elevated among these miners. A highly significant relation was noted between radon daughter exposure and risk of dying of lung cancer; the small numbers of salivary gland (n = 2) and buccal cavity and pharynx (n = 6) cancers precluded meaningful analysis of dose response. Attributable and relative risk coefficients for lung cancer were estimated as 6.3 deaths per working level month per million person-years and 0.9% per working level month, respectively. Relative risk coefficients were highest for those first exposed before age 20 years. Cigarette smokers had relative and attributable risk coefficients comparable to those of nonsmokers. Relative risks fell sharply with age, whereas attributable risks were lowest in the youngest and oldest age groups. The results suggest that efforts to raise existing occupational exposure standards may be inappropriate.

lung neoplasms; neoplasms; radiation; ionizing; radon

1From the Bureau of Chronic Disease Epidemiology, Laboratory Centre for Disease Control, Department of National Health and Welfare, Ottawa, Ontario, Canada KlA 0L2.


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