. Elementary and dental radiography . Fig. 310. Fig. .117 i-:g. .SU). Protective lead calinet; front 317. Protective lead cabinet; rear view. to the screen, lead glass of this thickness is highly translucent to theX-rays, but with the tube a distance of several feet the rays penetrate theglass but feebly. Instead of the lead glass window a screen ina\ be covered entirelywith lead and niirnn-s so arranged that the operator may observe his tubeand patient fr^^m his position back of the screen. Let it be clearh under.^tood that the man standing: behind a lead 284 DENTAL RADIOGRAPHY. Fig
. Elementary and dental radiography . Fig. 310. Fig. .117 i-:g. .SU). Protective lead calinet; front 317. Protective lead cabinet; rear view. to the screen, lead glass of this thickness is highly translucent to theX-rays, but with the tube a distance of several feet the rays penetrate theglass but feebly. Instead of the lead glass window a screen ina\ be covered entirelywith lead and niirnn-s so arranged that the operator may observe his tubeand patient fr^^m his position back of the screen. Let it be clearh under.^tood that the man standing: behind a lead 284 DENTAL RADIOGRAPHY. Fig. 318. Protective tube shield 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 OE 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 III), and those marie 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 ac
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