Radium Volume 17-18

Radium Volume 17-18

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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. 1921 edition. Excerpt: ...dose at 10 cm. below the skin surface is 130 per It is very important that the walls of the ionization chamber be constructed of material having an average low atomic weight, approximating as far as possible the composition of tissue. Kroenig and Friedrich first employed aluminum (at. wt. 27) but found that the graphited horn gave better results. In most of the older work this important point has been neglected. and therefore the older data are not directly comparable with Friedrich and Kroenig's. Figure 3. Photograph of Kroenig and Friedrich's apparatus for measuring gamma and x-ray intensity at a point. Figure 4. Schematic diagram of the water "phantom" used by Kroenig and Friedrich, to measure the intensity of ionization at various depths in water, this corresponding closely to the intensity of ionization produced in body tissues at corresponding depths. The gamma or x_ray beam played down vertically on. the surface of the water contained in the cylindrical zinc vessel, 35 cm. in diameter and 25 cm. high. Water filled the vessel to a depth of 20 cm. K is miero-ionization chamber with connecting cable to the electrometer. cent. greater than the dose based on calculations which only take into account the absorption of the rays and their divergence. R. M. Sievert, in an article on the Distribution of Intensity of the Primary Gamma Rays from Radium Applicators Used in Therapy, (Acta Radiologica (Stockholm) Vol. I, pp. 89-119, July 25, 1921), making the same general sort of measurement, with the exception that the tiny aluminum ionization chamber was placed in the axis of a glass test tube of about I mm. wall thickness, the test tube being immersed in water, found that the measured gamma ray dose corresponded within less than 2...show more

Product details

  • Paperback
  • 189 x 246 x 4mm | 163g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236990129
  • 9781236990129