. Elementary and dental radiography / by Howard Riley Raper . d and stand. screen is not completely protected from all X-rays. If the tube is ratherclose to the screen some of the X-rays may penetrate it—becoming ex-tremely feeble, however, by the time they make the penetration—and heis, of course, exposed to the secondary, tertiary and other sets of feeblerays which fill the room like light. But he is completely protected fromthe powerful dangerous rays. THE DANGERS OF THE X-RAY 285 The protective lead screen, or cabinet, or their equivalent, is anecessity in the practice of modern radiograph
. Elementary and dental radiography / by Howard Riley Raper . d and stand. screen is not completely protected from all X-rays. If the tube is ratherclose to the screen some of the X-rays may penetrate it—becoming ex-tremely feeble, however, by the time they make the penetration—and heis, of course, exposed to the secondary, tertiary and other sets of feeblerays which fill the room like light. But he is completely protected fromthe powerful dangerous rays. THE DANGERS OF THE X-RAY 285 The protective lead screen, or cabinet, or their equivalent, is anecessity in the practice of modern radiography. Protection shields are of three varieties: thoseProtection made of lead glass (Figs. 60, 61 and 63, Chapter III), Shields. those depending on a sheet of metallic lead for their action (Fig. 64, Chapter 111), and those made ofrubber impregnated with lead or a salt of lead (in appearance similar toFig. 64). The X-ray tube fits into the protection shield, which latter pro-tects the patient to a great extent against the action of all X-rays except Hf/A *. Fig. 319. Protection or safety, X-ray tube. those which pass through the window of the shield and are being usedto make the radiograph. As a matter of fact, the patient does not needthis protection in the practice of dental radiography, but it is not inex-pedient to use even protective measures that are thought to be unneces-sary. The operator is also protected in a degree by the protective protection shield calculated to take the place of a lead screen orcabinet is illustrated in Fig. 318. The protective material used is, I judgefrom its appearance, rubber impregnated with lead or a salt of lead. Themanufacturers claim to use a German preparation, the formula of whichis not divulged. This material is more opaque to the X-ray than leadglass, less opaque than metallic sheet lead. Protection or safety X-ray tubes are manufac- Protection tured. some of lead glass save for a window of ordi- X-Ray tubes. nary glass tran
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