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American Journal of Epidemiology Advance Access originally published online on July 27, 2007
American Journal of Epidemiology 2007 166(9):1015-1022; doi:10.1093/aje/kwm176
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American Journal of Epidemiology © The Author 2007. Published by the Johns Hopkins Bloomberg School of Public Health. All rights reserved. For permissions, please e-mail: journals.permissions@oxfordjournals.org.

ORIGINAL CONTRIBUTIONS

Leukemia Mortality among Workers at the Savannah River Site

David B. Richardson and Steve Wing

From the Department of Epidemiology, School of Public Health, University of North Carolina at Chapel Hill, Chapel Hill, NC

Correspondence to Dr. David B. Richardson, Department of Epidemiology, School of Public Health, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-8050 (e-mail: david.richardson{at}unc.edu).

Received for publication January 29, 2007. Accepted for publication May 11, 2007.

The authors investigated associations between ionizing radiation and leukemia mortality among workers at the Savannah River Site (South Carolina). A total of 18,883 workers hired between 1950 and 1986 were followed through 2002 to ascertain causes of death. Estimates of radiation doses from external sources and internal tritium uptakes were derived from dosimetry records through 1999. Radiation dose–mortality trends were evaluated for leukemia, leukemia excluding chronic lymphocytic leukemia, and myeloid leukemia. A positive association was observed between leukemia mortality and radiation dose under a 3-year lag assumption (excess relative rate/10 mSv = 0.04, 90% confidence interval: –0.00, 0.12). The association was of larger magnitude for leukemia excluding chronic lymphocytic leukemia (excess relative rate/10 mSv = 0.08, 90% confidence interval: 0.01, 0.20) and myeloid leukemia (excess relative rate/10 mSv = 0.12, 90% confidence interval: 0.02, 0.35). Compared with males, females had less complete dosimetry information; when analyses were restricted to males, the estimated association for each cause of death increased slightly in magnitude and goodness of fit. Exposures accrued 3–15 years prior were more strongly related to leukemia than exposures in the more distant past. This study provides evidence of positive associations between radiation dose and leukemia mortality among Savannah River Site workers. The temporal patterns of association appear consistent with those in studies of populations exposed at higher dose rates.

leukemia; mortality; nuclear energy; radiation, ionizing; South Carolina

Abbreviations: CI, confidence interval; CLL, chronic lymphocytic leukemia; ERR, excess relative rate; ICD, International Classification of Diseases


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D. B. Richardson, H. Sugiyama, S. Wing, R. Sakata, E. Grant, Y. Shimizu, N. Nishi, S. Geyer, M. Soda, A. Suyama, et al.
Positive Associations Between Ionizing Radiation and Lymphoma Mortality Among Men
Am. J. Epidemiol., April 15, 2009; 169(8): 969 - 976.
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