Practical points in the use of X-ray and high-frequency currents (1909) (14570971398)

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. 44.—Illustrating the Necessity of a Diaphragm for UseWhen Making a Radiograph. Above figure shows the wild rays from the entire front of the tube fallingon the object to be radiographed and then on to the X-ray plate itself,tending to cause an indistinct plate. skin, and is escharotic to a marked degree if thetube is placed too close. The action of the X-ray is not only upon the surface, but upon alltissues, and is effectual at greater distances thanthe cathode ray. The strength of the rays is inversely propor- 86 X-Ray and High-Frequency Currents tional to the square of the distance of the tubefrom the patient. Example: Let twelve inchesdistance from the patient represent one. At sixinches distance we have four times the effect;at three inches5 distance four times four or six-teen times; at one and one-half inches distancesixteen times sixteen or 256 times. This is apoint often lost sight of and is of extreme im-

Text Appearing After Image:

Fig. 45.—Above figure shows the same tube as Fig. 44, but having adiaphragm which cuts off all of the wild rays except the few which gothrough the opening, thus tending to make the negative very muchmore distinct. As the danger from the careless use of the X-ray isnow well known and understood, every operator should take all nec-essary precautions to protect not only his patient, but himself. Fortreatment purposes, the lead glass tubes should be used, or the tubeshould be inclosed in a protecting shield. In addition to this, theoperator should stand behind a shield lined with lead one-thirty-secondof an inch in thickness. neglect is the cause of most portance. Itsaccidents in burning. What is Meant by the Inverse Current. When we close the switch of a coil, a current X-Ray Tubes 87 flows from one pole to the other. This is themake current. The interrupter breaks the cir-cuit, and a current, usually stronger, flows back.This is the break current. This alternation ofthe current occurs

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1909

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