. Elementary and dental radiography / by Howard Riley Raper . Fig. 5fi. High-frequency X-ray Fig. 57. High-frequency X-ray tube. out from the tube in every direction intersecting the direct rays. Second-ary rays are also given off from any object which X-rays strike. Thus,direct rays will strike a wall; secondary rays are given off from the walland strike the other walls, the floor, and the ceiling, whereupon a newset of X-rays, tertiary rays, are produced. When the tertiary rays strikean object still another set of X-rays are generated, and so on, each newset of rays being much shorter
. Elementary and dental radiography / by Howard Riley Raper . Fig. 5fi. High-frequency X-ray Fig. 57. High-frequency X-ray tube. out from the tube in every direction intersecting the direct rays. Second-ary rays are also given off from any object which X-rays strike. Thus,direct rays will strike a wall; secondary rays are given off from the walland strike the other walls, the floor, and the ceiling, whereupon a newset of X-rays, tertiary rays, are produced. When the tertiary rays strikean object still another set of X-rays are generated, and so on, each newset of rays being much shorter and weaker than the former. So a roomin which an X-ray tube is excited is filled with X-rays—not with thedirect rays, but with the comparatively feeble and inconsequential sec-ondary, tertiary and other subordinate rays. 58 ELEMENTARY RADIOGRAPHY Classification of X-ray tubes are of different sizes. The bulb X-Ray Cubes varies in diameter from five to eight inches. Thus .Recording to Size. we have the five-inch tube, six-inch tube, and so six-inch tube is about right for dental work.
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