Radiographic abnormalities in long-tenure Vermont granite workers and the permissible exposure limit for crystalline silica

Journal of Occupational and Environmental Medicine
W G GrahamB Sisco-Cheng

Abstract

This study was undertaken to assess the prevalence of radiographic abnormalities consistent with silicosis in a group of 600 retired granite workers who were receiving pensions. Files of regional clinics and hospitals were searched for chest radiographs taken on these men, and 470 x-ray films suitable for interpretation were located. After exclusions (women, and men who had worked in the granite industry elsewhere), 408 x-ray films were independently read by three experienced readers using the 1980 International Labour Office scheme. Dust exposures were estimated for workers hired after 1940, when the dust-control standard of 10 million particles per cubic foot (mppcf) (equivalent to 0.1 mg/m3) was put in place and monitored by the Vermont Division of Industrial Hygiene. Dust levels were initially high but were gradually reduced from 1940 to 1954, after which average quartz exposures stabilized to a mean of approximately 0.05 to 0.06 mg/m3; however, about 10% to 15% of samples after 1954 exceeded 0.1 mg/m3. Of the 408 x-ray films, 58 were taken on workers hired before dust controls were instituted in 1940, and 25.9% showed abnormalities (a profusion score of 1/0 or greater). A total of 350 x-ray films were taken on workers hire...Continue Reading

References

Jan 1, 1989·American Journal of Industrial Medicine·D C MuirC D Bernholz
May 1, 1973·American Industrial Hygiene Association Journal·H E AyerL DiBerardinis
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Citations

Jun 7, 2002·Applied Occupational and Environmental Hygiene·Arthur R Wickman, Paul J Middendorf
Jan 14, 2011·Journal of Occupational and Environmental Hygiene·Dave K VermaWilliam G Graham
Sep 22, 2010·Occupational and Environmental Medicine·Pamela M VacekGraham W Gibbs
Nov 9, 2016·Occupational and Environmental Medicine·Pamela M Vacek, Peter W Callas
Apr 30, 2002·Journal of Occupational and Environmental Medicine·Kenneth D RosenmanVicki Hertzberg
Jan 30, 2004·American Journal of Industrial Medicine·Michael D Attfield, Joseph Costello
May 29, 2004·Journal of Occupational and Environmental Medicine·W G B GrahamP M Vacek

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