American Journal of Epidemiology Vol. 148, No. 6: 564-574
Copyright © 1998 by The Johns Hopkins University School of Hygiene and Public Health
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First Analysis of Mortality and Occupational Radiation Exposure based on the National Dose Registry of Canada
1Radiation Protection Bureau, Health Canada Ottawa, Ontario K1A 1C1, Canada
2Health Protection Branch, Health Canada Ottawa, Ontario K1A 0L2, Canada
3Faculty of Medicine, University of Ottawa Ottawa, Ontario K1H 8M5, Canada
4Institute of Radiation Medicine, Chinese Academy of Medical Sciences P.O. Box 71, Tianjin 300192, People's Republic of China
Reprint requests to Dr. J. P. Ashmore, Radiation Protection Bureau, Health Canada, 775 Brookfield Road, Ottawa, Ontario K1A 1C1, Canada.
A cohort mortality study of occupational radiation exposure was conducted using the records of the National Dose Registry of Canada. The cohort consisted of 206,620 individuals monitored for radiation exposure between 1951 and 1983 with mortality follow-up through December 31, 1987. A total of 5,426 deaths were identified by computerized record linkage with the Canadian Mortality Data Base. The standardized mortality ratio for all causes of death was 0.61 for both sexes combined. However, trends of increasing mortality with cumulative exposure to whole body radiation were noted for all causes of death in both males and females. In males, cancer mortality appeared to increase with cumulative exposure to radiation, without any clear relation to specific cancers. Unexplained trends of increasing mortality due to cardiovascular diseases (males and females) and accidents (males only) were also noted. The excess relative risk for both sexes, estimated to be 3.0% per 10 mSv (90% confidence interval 1.1–4.8) for all cancers combined, is within the range of risk estimates previously reported in the literature. Am J Epidemiol 1998;148:564–74.
leukemia; radiation-induced; mortality; neoplasms; radiation-induced; occupational exposure; radiation; ionizing; risk
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