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  • Title: Radiographic changes in a group of chrysotile miners and millers exposed to low asbestos dust concentrations.
    Author: Cordier S, Theriault G, Provencher S.
    Journal: Br J Ind Med; 1984 Aug; 41(3):384-8. PubMed ID: 6331495.
    Abstract:
    Radiographic changes in 342 Quebec asbestos miners exposed to low levels of asbestos dust for an average period of 20 years were studied. Their estimated cumulative exposure ranged from 7 fibres per cubic centimeter X years (f-y/cc) to 300 f-y/cc. Of these workers, 2.1% showed a small opacity score of 1/0 or more and 2.7% showed pleural changes. No linear relationship could be established between small opacity score and any index of exposure to asbestos. Pleural changes were related to age. A referent group of office workers within the same mining industry showed a prevalence of 2.1% (1/48) for small irregular opacities 1/0 or more, and for pleural changes.
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