Abstract
Chrysotile, amosite and crocidolite fibers detected in autopsy tissue specimens from cases of mesothelioma and controls have been characterized by particle length, diameter and aspect ratio using a transmission electron microscope. The pooled information from such specimens reveals that the fibers of each mineral type detected in biological material have very different physical characteristics although in all samples fibers less than 5 microns in length are predominant by number while fibers over 25 microns in length are found very infrequently. Chrysotile fibers on average appear as the shortest fibers with the most fine diameter distribution, amosite fibers are on average the longest with the most coarse diameter distribution, crocidolite fibers on average have dimensions which are intermediate between both chrysotile and amosite. The percentage number of fibers of chrysotile, amosite and crocidolite detected with an aspect ratio less than or equal to 10 were 31.7%, 24.2% and 18.5% respectively.
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