. Cytology. Cytology. X rays. Photograhic emulsions are suspensions of silver halide crystals in gelatin. As a result of exposure to light or ionizing radiation (, X rays), the silver bromide crystals are reduced to metallic silver (black) by photographic development. The resultant negative can be examined and rephotographed at higher magnifications by means of the conven- tional optical microscope (Figure 11-31). In projection microradiography, the photographic film is moved back from contact with the specimen. This results in enlargement of the shadow produced by the X rays passing throu
. Cytology. Cytology. X rays. Photograhic emulsions are suspensions of silver halide crystals in gelatin. As a result of exposure to light or ionizing radiation (, X rays), the silver bromide crystals are reduced to metallic silver (black) by photographic development. The resultant negative can be examined and rephotographed at higher magnifications by means of the conven- tional optical microscope (Figure 11-31). In projection microradiography, the photographic film is moved back from contact with the specimen. This results in enlargement of the shadow produced by the X rays passing through the specimen and falling on the photographic emulsion (Figure 11-30). The principle of projec- tion microradiography is utilized in the construction of the compound. Figure 11-31. Contact Radiograph of Transverse Section of Human Bone. (From Kirkpatrick, P. and Pattee, H. H., Jr., 1953. '"Approaches to X-Ray Microscopy," in Lawrence, J. H. and Tobias, C. A. (Eds.), Advances in Biol. Med. Physics, 3, Academic Press Inc., New York, N. Fie. 1, p. 249.) SURVEY OF CYTOLOGICAL TECHNIQUES/ 253. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Wilson, G. B. (George Bernard), 1914-; Morrison, John H. (John Herbert), 1927-. New York, Reinhold
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