Abstract
Present methods for assessing atmospheric dustfall measure the weight of settled particles, but the nuisance produced by dustfall is a visual one which is associated with particle projected area. A rapid, simple experimental technique is proposed to evaluate the projected area of dustfall collected on microscope slides during sampling periods as short as 4 hr. The method is based on exposing the slide to evaporated aluminum in a vacuum chamber, followed by removal of adhering particles to produce an opaque slide with transparent apertures formed during evaporation. The area of the apertures is determined on an optical bench by measuring light transmission through the treated slide. The experimental procedures and apparatus are discussed in detail.
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