. Elementary and dental radiography / by Howard Riley Raper . ike 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 size
. Elementary and dental radiography / by Howard Riley Raper . ike 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. With use the glass of the active hemisphere of the tube discolors toa purplish color. This does not materially affect the tube. The fatal injury to most tubes is a puncture. One means of guard-ing against punctures is to keep the tube clean. A fruitful cause of. Fig. 58. Tube rack for tubes when not in use. puncture is the discharging of the current from the tube into the rack onwhich the tube is kept when not in use. The tube may have been dis-charged by the operator touching the terminals before putting the tubeaway, but if the tubes are stored in the same room where high-frequencyand other coil discharges are taking place, they will recharge themselvesfrom the atmosphere and discharge onto the rack, no matter of whatmaterial the rack may be made. A safe way of putting away tubes is toconnect the anode and cathode terminals together by a wire during thetime the tube is at rest. The general principle of construction of the fiigb-Trequency high-frequency X-ray tube (Figs. 56 and 57) are X-Ray tube. those already given in the description of the tubes built to be operated by a unidirectional current. The X-RAY TUBES AXD THE X-RAYS 59 chief difference between the high-frequency tubes
Size: 2007px × 1245px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., book, bookauthorraperhowardriley, bookcentury1900, bookdecade1910
