Abstract
Transmission electron microscope (TEM) and phase contrast microscope (PCM) fiber counts from the same filter were compared. Industrial hygiene samples from operations within a chrysotile mine, crusher, mill and tailings site, a brake manufacturing industry, and a taping products manufacturer were used. A total of 10 318 individual fibers were analyzed from 65 filter samples. The aim of the study was to derive the relationships between TEM counts and PCM counts that could be used in the extrapolation of risk estimate from occupational exposure to low-level nonoccupational exposure to asbestos. The results show that ratios of EM-PCM equivalent to PCM counts vary between 1.4 to 3.2. The proportion of long thin fibers (L>8 µm, D<1.5 µm) increased as the asbestos operation moved from primary sector (mining) to end use sector (manufacturing).
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More From: American Industrial Hygiene Association Journal
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