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.
© 1950 Optical Society of AmericaFull Article | PDF Article
OSA Recommended Articles
F. E. Wright
J. Opt. Soc. Am. 21(8) 485-496 (1931)
L. C. Martin and T. R. Wilkins
J. Opt. Soc. Am. 27(10) 340-349 (1937)
J. Opt. Soc. Am. 39(11) 891-897 (1949)