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Evaluation of annual external radiation doses at values near minimum detection levels of dosimeters at the Hanford Nuclear Facility.

Authors
Richardson-D; Wing-S; Watson-J; Wolf-S
Source
J Expo Anal Environ Epidemiol 2000 Jan-Feb; 10(1):27-35
NIOSHTIC No.
20022155
Abstract
In epidemiological studies of workers exposed to ionizing radiation, recognition of the limitations of available radiation dosimetry dada is important to interpretation of a study's findings. This paper provides an investigation of external radiation dosimetry data for workers at the Hanford nuclear facility, focusing on changes over time in practices for recording dosimetry measurements that were between zero and the minimum detectable level of a radiation dosimeter. Reported annual external radiation doses for the years 1944-1989 were examined for 33.459 workers; these records are the sum of periodic dosimetry measurements within a calendar year. For each year, the proportion of annual external doses with values in the range of minimum detectable level was examined. Contrary to previous researchers, we conclude that there is evidence that dosimetry measurements with values between zero and the minimum detectable level may have been recorded as zero in some historical periods. This conclusion is supported by evidence drawn from historical documentation about radiation dosimetry practices at the Hanford facility. Although workers at the Hanford facility have relatively complete and detailed external radiation dosimetry data compared to some other nuclear facilities that began operation in the 1940s, these data may suffer limitations related to dosimetry recording practices at the facility.
Keywords
Dosimetry; Epidemiology; Radiation; Radiation-exposure; Radiation-levels; Humans
Contact
Dr. David Richardson, Department of Epidemiology, School of Public Health, CB #8050, Nationsbank Plaza, University of North Carolina, Chapel Hill, NC 27599-8050
CODEN
JEAEE9
Publication Date
20000101
Document Type
Journal Article
Email Address
drichard@sph.unc.edu
Funding Amount
681155
Funding Type
Grant
Fiscal Year
2000
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R01-CCR-412931
Issue of Publication
1
ISSN
1053-4245
Source Name
Journal of Exposure Analysis and Environmental Epidemiology
State
NC; WA
Performing Organization
Department of Epidemiology, School of Public Health, University of North Carolina, Chapel Hill, North Carolina
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