X-Ray Manual, U. S. Army

X-Ray Manual, U. S. Army

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1917 edition. Excerpt: ...If 40 M.A. minutes are used in fluoroscopy at 5 M.A., and 10 M.A. are used for radiographic work before or after the fluoroscopy, then only a two-minute exposure can be made; if 15 seconds are needed at this current, a maximum of 8 plates could be made. A very important point to remember is that when using a smaller gap although the amount of radiation reaching the skin is less, the exposure required in radiographic work is very much longer. To get the same plate density at lower gaps, the skin risk is greater. Many cases of dermatitis are due to prolonged or repeated exposure with too small a back-up gap for the work in hand. When an erythema dose is reached or approached, an interval of three weeks should elapse before again exposing. Be sure that unfiltered rays along the axis of the tube, which do not have to pass through the lead glass bowl, do not reach the patient. Exposure beyond an erythema dose may be justified when cir.cumstances arise of an unusual nature. But the surgeon or attending physician should decide when such a risk is to be taken. Protection of the Operator. The element of increase in the work time makes care in the protection of the operator of extreme importance. Two things are clear in this matter: First, that effects are cumulative; second, that evidence of injury may develop late. Since the demands of the art fix the amount of radiation for specific purposes, the operator can do only three things for self-protection. (1) Increase the distance from the target to any part of his body. (2) Interpose absorbing material between himself and the tube. (3) Reduce the time devoted to the work. The first of these is applicable in radiographic w, ork only, as in fluoroscopy he must work at close range. The third can have..show more

Product details

  • Paperback | 50 pages
  • 189 x 246 x 3mm | 109g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236834267
  • 9781236834263