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- W1969854013 abstract "Abstract To study the comparability of results of airborne fiber concentrations with field samples using the phase contrast optical microscopy methods [National Institute for Occupational Safety and Health (NIOSH) 7400, International Standards Organization (ISO), modified P&CAM 239, and Institut de Recherche en Santé et en Sécurité du Travail (IRSST) 243], samples were collected in asbestos mill, asbestos cement, and asbestos textile workplaces. These samples were counted by 12 experienced counters and the results compared between counts on the same sample for NIOSH Method 7400, ISO, and IRSST Method 243, and between counts of paired samples for all four methods. All statistical significance tests were performed at the 5 percent probability level (size of test). The geometric averages of the results in field samples of individual observations with their geometric standard deviations were in the following order: the modified P&CAM Method 239: 61 percent (1.19) larger, NIOSH Method 7400: 28 percent (1.23) larger, and ISO: 26 percent (1.23) lower than the IRSST Method 243 method. These results indicate that to improve comparability of results, an international consensus should be reached and maintained in all the details of the phase contrast optical microscopy method for the determination of fiber concentration in workplace atmospheres." @default.
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- W1969854013 date "1994-10-01" @default.
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- W1969854013 title "Comparison of Four Methods for the Determination of Asbestos Fiber Concentrations in Workplace Atmospheres by Phase Contrast Microscopy" @default.
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- W1969854013 doi "https://doi.org/10.1080/1047322x.1994.10388398" @default.
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