. Radiography and radio-therapeutics . ation of the negative. Secondary rays are also produced, or adiffusion of the primary rays takes place in the patients body. It is prob-able that both of these manifest themselves during a long exposure. Fig. 76 RADIOGKAPHY shows the path taken by the primary beam, and the manner of projection ofsecondary rays upon the photographic plate. The X-rays, a, a, emanating from the focus of the anti-cathode projecta shadow, B B, of the object, 0, on the plate. If there were no secondaryrays this shadow would be of uniform darkness from B to B, and the space,BCD,
. Radiography and radio-therapeutics . ation of the negative. Secondary rays are also produced, or adiffusion of the primary rays takes place in the patients body. It is prob-able that both of these manifest themselves during a long exposure. Fig. 76 RADIOGKAPHY shows the path taken by the primary beam, and the manner of projection ofsecondary rays upon the photographic plate. The X-rays, a, a, emanating from the focus of the anti-cathode projecta shadow, B B, of the object, 0, on the plate. If there were no secondaryrays this shadow would be of uniform darkness from B to B, and the space,BCD, would be free from any shadow. But if any current discharges inthe wrong direction, the so-called secondary rays are generated on the glassof the tube. They are indicated by the dotted lines b b. Although weakerin intensity, they project shadows, and in another direction than the primaryrays will do ; the shadows overlap, and the part between A B will not be sodark as that between A A and the space between B C will not be as clear as. ^ <^
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