Abstract
Abstract The use of a direct method of sample preparation for transmission electron microscopy (TEM) analysis has allowed accurate measurement of airborne asbestos fibre size distributions. In this paper, a fibre size dependent model for the carcinogenic potency of fibres by POTT (1978) and another for lung retention by TIMBRELL (1982) have been applied to asbestos size distributions from the occupational and non-occupational environment. The results have been used to assess the effectiveness of current optical phase contrast microscope (PCM) and scanning electron microscope (SEM) procedures. A wide spread of values was found for airborne distributions, with the PCM analysis measuring about 70–80% of the potential carcinogenic hazard for amosite and 20–60% for chrysotile and crocidolite.
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