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Radiation Protection Dosimetry Advance Access originally published online on June 10, 2008
Radiation Protection Dosimetry 2008 131(2):188-197; doi:10.1093/rpd/ncn165
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© The Author 2008. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Dose reconstruction for an occupational cohort at the Savannah River nuclear facility: evaluation of a hybrid method

Ghassan Hamra1, Leena A. Nylander-French1 and David Richardson2,*

1 Department of Environmental Sciences and Engineering, The University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-7400, USA
2 Department of Epidemiology, School of Public Health, The University of North Carolina at Chapel Hill, CB #7435, McGavran-Greenberg, Chapel Hill, NC 27599-7400, USA

* Corresponding author: david.richardson{at}unc.edu

Received November 27, 2007, amended March 25, 2008, accepted April 21, 2008

The Savannah River Site (SRS) is the only nuclear facility in the United States that produces tritium, a radioactive isotope of hydrogen. The purpose of the study was to derive annual tritium dose estimates for SRS employees through the development of a job-exposure matrix. The proposed method is unique in that along with qualitative information on job, area and time of employment, it utilises recorded annual whole-body dose measures, when available, in order to estimate doses from tritium intakes of the monitored workers. Using information from 75 253 dose measures for the period 1954–1978, the average proportion of the whole-body dose that was due to tritium intake was calculated; these proportions were allowed to vary by job, area and time period. This information was used to assign tritium dose levels for 43 590 employment-years. The collective estimated tritium dose was 4319 mSv compared with the total known tritium dose of 17 382 mSv. The correlation (R2) of estimated tritium dose with known tritium dose was 0.68.


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