The use of light scattering for the detection of filter samples of fibrous aerosols.
Cincinnati, OH: U.S. Department of Health, Education, and Welfare, Public Health Service, Centers for Disease Control, National Institute for Occupational Safety and Health, DHEW (NIOSH) Publication No. 78-105, 1978 Jan; :1-57
The use of light scattering from fibrous dusts has been investigated, and it was found that straight fibers have a sufficiently distinctive scattering pattern that may be counted electronically. Curved fibers may also be detected by focusing the light source so as to illuminate only a small, relatively straight section of the fiber. Theoretical and experimental data, and the design of a proposed instrument, are presented. The validity of the assumptions, which the proposed instrument contains, can best be probed by constructing a prototype based on the general outline given, and performing numerous measurements on the light scattering properties of individual fibers and field filter samples as a whole. The proposed instrument would fill a need in industrial hygiene to obtain rapid, accurate measurements of personal exposures to asbestos and other fibrous dusts.
NIOSH-Publication; Photometry; Dust-counters; Samplers; Radiation; Dispersion
NTIS Accession No.
DHEW (NIOSH) Publication No. 78-105
National Institute for Occupational Safety and Health