. The principles and practice of roentgenological technique . num is used for the fixation of theelectrodes in the glass, because it has the sameheat expansion coefficient as glass. Theanticathode must be of such a metal as hasa high atomic weight, a high melting point,and be capable of considerable heating with-out disintegration. Its construction and posi-tion in the bulb should be such as to permitrapid radiation of heat and to give absoluteimmobility. This makes sharp focusing of the Fig. 74.—A double target (stereoscopic) tube withair cooling device (radiator). cathode possible. Platinum,
. The principles and practice of roentgenological technique . num is used for the fixation of theelectrodes in the glass, because it has the sameheat expansion coefficient as glass. Theanticathode must be of such a metal as hasa high atomic weight, a high melting point,and be capable of considerable heating with-out disintegration. Its construction and posi-tion in the bulb should be such as to permitrapid radiation of heat and to give absoluteimmobility. This makes sharp focusing of the Fig. 74.—A double target (stereoscopic) tube withair cooling device (radiator). cathode possible. Platinum, tantalum, iridiumand tungsten are the metals used. By improvement in pumping methods, thepenetration of the rays emitted was exhaustion of the modern tube leavesless than 1/1,000,000 of an atmosphere. The gas, which adheres to the walls of the tube andthe electrodes, is removed by heating from theoutside, the tube being energized while»-it isbeing exhausted. The plan of construction of the modernx-ray tube is indicated in Fig. 7i. The tube.
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectradiogr, bookyear1920
