Microscopical tests, including polarized light microscopy (PLM), phase contrast microscopy (PCM), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were used along with X-ray diffraction (XRD) in the characterization and testing of a laboratory-grade “Gooch fiber” asbestos sample. The sample was tested for possible fiber release during typical use as a substrate for gravimetric analysis methods. While preparing substrates, the concentrations of airborne asbestos fibers greater than 5 micrometers in length were approximately one fiber per cubic centimeter of air.
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