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    Dust Monitoring by the Dry Slide Settling Technique

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    This paper describes a dry slide settling technique developed to obtain a reliable count of the dust conditions in a clean room. The dust is counted, sized, and evaluated microscopically after the particulate matter is captured on clean, dry slides placed horizontally at different locations in the room.

    The success of the method is made possible largely by the type of microscope used. The projection microscope used in this technique speeds up the counting procedure and allows the operator to view and count the dust field projected upon a 7-in. ground-glass screen at a convenient eye level, thus overcoming operator fatigue and loss of accuracy.

    In addition, the projection microscope has other advantages: 1. Easy Particle Sizing.—The 7-in. ground-glass screen is gridded in 1-mm squares. Particles are sized by screen division and later converted to actual size in microns. 2. As an Educational Tool.—The projection microscope allows more than one person to view the dust field simultaneously. This is of great importance in educating clean-room workers. It is often difficult for the nonscientific person to visualize the amount of dust present in any atmosphere. 3. Particle Identification.—Materials from suspected sources can be mounted on slides and compared with collected particulate matter.

    Author Information:

    Whitfield, W. J.
    Sandia Corp., Albuquerque, N. Mex.

    Marsh, R. C.
    Sandia Corp., Albuquerque, N. Mex.

    Kodel, I. M.
    Sandia Corp., Albuquerque, N. Mex.

    Committee/Subcommittee: F01.10

    DOI: 10.1520/STP41220S