Abstract

Tracks and stars in nuclear track plates are usually found by ordinary bright-field microscope procedures affording limited field of view and requiring continual focusing up and down. Standard dark-field illumination schemes fail due to background scattering by fog grains. A rotating-azimuth, planar, dark-field, illumination scheme has been developed which provides sufficient contrast so that low magnification (50 to 100 times) may be used. The field of view is thereby increased to 2 to 4 mm and the depth of field becomes comparable to the total thickness of the emulsion.

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