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  2. Polarized light microscopy - Wikipedia

    en.wikipedia.org/wiki/Polarized_light_microscopy

    Polarized light microscopy can mean any of a number of optical microscopy techniques involving polarized light. Simple techniques include illumination of the sample with polarized light. Directly transmitted light can, optionally, be blocked with a polariser oriented at 90 degrees to the illumination. More complex microscopy techniques which ...

  3. Health impact of asbestos - Wikipedia

    en.wikipedia.org/wiki/Health_impact_of_asbestos

    A fiber cannot be identified or ruled out as asbestos, either using the naked eye or by simply looking at a fiber under a regular microscope. The most common methods of identifying asbestos fibers are by using polarized light microscopy (PLM) or transmission electron microscopy (TEM). PLM is less expensive, but TEM is more precise and can be ...

  4. Dispersion staining - Wikipedia

    en.wikipedia.org/wiki/Dispersion_staining

    The dispersion staining is an analytical technique used in light microscopy that takes advantage of the differences in the dispersion curve of the refractive index of an unknown material relative to a standard material with a known dispersion curve to identify or characterize that unknown material. These differences become manifest as a color ...

  5. WELL Building Standard - Wikipedia

    en.wikipedia.org/wiki/WELL_Building_Standard

    For X02 Interior Hazardous Materials Management, if the building was constructed before the enactment of asbestos banning law, an inspector must qualifies for asbestos containing materials (ACM) and performs polarized light microscopy (PLM) or transmission electron microscopy (TEM). ACM must be removed from the project if it was found.

  6. Health effects arising from the September 11 attacks - Wikipedia

    en.wikipedia.org/wiki/Health_effects_arising...

    Dr. Cate Jenkins, a whistle-blower EPA scientist, said that on September 12, 2001, a regional EPA office offered to dispatch 30 to 40 electron microscopes to the WTC pit to test bulk dust samples for the presence of asbestos fibers. Instead, the local office chose the less effective polarized light microscopy testing method. Dr.

  7. Rescue and recovery effort after the September 11 attacks on ...

    en.wikipedia.org/wiki/Rescue_and_recovery_effort...

    Cate Jenkins, a whistle-blower EPA scientist, said that on September 12, 2001, a regional EPA office offered to dispatch 30 to 40 electron microscopes to the WTC pit to test bulk dust samples for the presence of asbestos fibers. Instead, the local office chose the less effective polarized light microscopy testing method. Dr.

  8. Chrysotile - Wikipedia

    en.wikipedia.org/wiki/Chrysotile

    Three polytypes of chrysotile are known. [8] These are very difficult to distinguish in hand specimens, and polarized light microscopy [6] must normally be used. Some older publications refer to chrysotile as a group of minerals—the three polytypes listed below, and sometimes pecoraite as well—but the 2006 recommendations of the International Mineralogical Association prefer to treat it as ...

  9. McCrone Research Institute - Wikipedia

    en.wikipedia.org/wiki/McCrone_Research_Institute

    The McCrone Research Institute incorporates enhanced lecture rooms and laboratories, a museum, library, reference collections, atlases, databases, and other teaching materials relating to microscopy and microanalysis in its own 11,000 square feet (1,000 m 2) building and is the principal microscopy training organization for tens of thousands of ...

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