Practical points in the use of X-ray and high-frequency currents (1909) (14754439311)

Identifier: practicalpointsi00judd (find matches)

Title: Practical points in the use of X-ray and high-frequency currents

Year: 1909 (1900s)

Authors: Judd, Aspinwall

Subjects: X-rays Electrotherapeutics Radiography X-Rays Radiography

Publisher: New York : Rebman Company

Contributing Library: Francis A. Countway Library of Medicine

Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School

Text Appearing Before Image:

Fig. 40.—Represents the English Derma tube, it being practically atype of the original Crookes tube, the X-rays being generated at theclosed end of the tube so that their penetration is very slight. a shield to cut off undesirable rays. Fis Owing to the heat generated, it has been foundnecessary to use an extra tube to cover this ex-tension and the under space filled with water,

Text Appearing After Image:

Fig. 41.—A modification of the Derma tube designed by Doctor Cald-well. The rays from this tube are much more penetrating than fromthe Derma tube, owing to the fact that the cathode stream strikes ona platinum plate at the end of the projection. This tube is intendedparticularly for treating cavities. Owing to it becoming very hot,however, a glass jacket containing water is required which reduces itsefficiency very much. so that it makes a rather inconvenient tube forpractical use. (See Fig. 41.) 74 X-Ray and High-Frequency Currents The efficiency of an X-ray tube dependsupon the following factors: (1) The cathode must be an absolute segmentof a circle. (2) The anode must be heavy, with a thickfacing of platinum, and must be so placed thatthe converging cathode stream will be receivedupon the center of its beveled surface. (3) The larger the globe, the greater the radi-ating surface and the less rapidly will the tubeheat up. (4) It is essential that there shall be no imper-fections

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1909

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