Ann. occup. Hyg., Vol. 46, No. 7, pp. 587-596, 2002
© 2002 British Occupational Hygiene Society
Published by Oxford University Press
Assessment of Historical Exposures to Talc at a Mining and Milling Facility
1 Department of Environmental Health Sciences, University of Alabama at Birmingham School of Public Health, Birmingham, AL 35294-0022, USA; 2 Environmental Health Sciences Program, Institute of Health and Sport Sciences , University of Tsukuba, Tsukuba, Japan; 3 Department of Epidemiology and International Health, University of Alabama at Birmingham School of Public Health, Birmingham, AL 35294-0022, USA
Received 15 August 2001; in final form 24 June 2002
The purpose of this study was to develop an estimate of exposure to respirable dust for all job categories and all years in a retrospective follow-up study of worker mortality in a talc mining and milling facility. All jobs were assigned to work areas that were considered to have similar exposure profiles. Uniform exposure time periods during which non-random, deterministic variables were thought to be constant were identified and an experienced rater assigned categorical exposure scores to each work area/time period. These scores and measured baseline respirable dust concentrations were used to calculate the estimated job area/year concentrations for each work area/time period. Estimates were compared to available historical measurements. The estimated exposures ranged from 1.7 to 0.1 mg/m3 and displayed a decreasing trend over time. When compared with measured exposures, the estimated exposures had a correlation coefficient of 0.55 with an average difference of 0.01 mg/m3 and a range of 0.60 to –0.48 mg/m3. The estimates were considered to be acceptable for determining relative ranking of subjects according to cumulative exposure.
Keywords: exposure estimation; occupational exposure; talc
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