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Practical Measurements in Radio-Activity

Practical Measurements in Radio-Activity


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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1912 Excerpt: ...type of radiation to half its value. For this purpose paper serves very well as the absorbing medium. The measurements with a rays must be made in an a-ray electroscope, and a source of uncovered active deposit from radium or thorium is used. The quantity of paper required to cut the activity down to half can be found by interposing screens of thin tissue paper (cigarette paper). For the /3 rays the same source may be used, and ordinary sheets of note paper interposed to absorb the rays. For the y rays much greater thicknesses of the absorbing material are required, and books may be interposed between the source of radiation and the electroscope until the radiation is cut down to a determined fraction, from which the thickness to reduce the radiation to half value can be calculated. Russell and Soddy, Phil. Mag. 21. 130, 1911. The quantity of paper necessary to absorb half of each type of radiation will be seen from the following approximate numbers obtained with thorium active deposit: a rays 0003 centimetres, rays 0-2 y rays 15 0 43. Excited Radiation produced by y Rays. When y rays strike a plate scattering takes place just as in the case of /3 rays; but in addition to this effect /3 rays are radiated from the plate struck by the y rays. The new type of rays thus produced is spoken of as excited radiation. The /3 radiation comes out on both sides of the plate. That emitted on the side at which the y rays enter is called the "incidence" radiation, and that emitted on the other side is called the "emergence" radiation. The incidence and emergence radiations are different in amounts and have different velocities, and this dissimilarity is more marked with some substances than with others. In this paragraph only the i...


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Product Details
  • ISBN-13: 9781130453003
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 42
  • Spine Width: 2 mm
  • Width: 189 mm
  • ISBN-10: 1130453006
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 95 gr


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