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Airborne particulate matter has been counted in the size range of 0.32 μ to 8 μ by means of the scattered-light technique. Dust levels in a variety of typical work areas employed in electronic device development and manufacture are reported with a description of some of the factors contributing to these levels. Other measurements relate dust counts to the number of personnel and their activity, to changes in personnel levels during a 24-hr period, to filtering methods employed to remove dust, and work-hood design. A comparison is made of these counts with counts obtained by the petri dish method, which counts are indirectly similar, and with the proposed ASTM referee method.
Pudvin, J. F.
Member Technical Staff, Bell Telephone Laboratories, Allentown, Pa.