| 초록 |
We examined several methods of measurement of chrysotile, one of several fibroid forms of asbestos under various environmental conditions, and evaluated those methods using modal analysis by polarized microscope, X-ray diffraction (XRD) analysis, and the phase contrast and dispersion microscope (PCDM) analysis. In comparison between modal and the PCDM analysis indicated that the fibroid asbestos contents in the almost completely ground powder samples are very low, which is less than the standard of the work environment concentration. However, the cross fiber vein type chrysotile associated with a granitic body is not broken to unfibroid grains by the grinding process. This means that different degrees of crystallinity of the chrysotile may cause several fibroid forms of asbestos. Examination of asbestos dispersal during the grinding of samples in the draft chamber indicates that moist conditions tend to diminish the dispersal of asbestos compared to dry conditions. |
