Radiations from Radioactive Substances

Radiations from Radioactive Substances

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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. 1913 edition. Excerpt: ...1910. B' about 920, and then increases again to the temperature of fusion, about 1000, when the Whole of the emanation is liberated. There is evidence that the fall of the curve to a minimum is connected with an actual change of the physical state of the compound. Kolowrat also observed the interesting point that the ' loss of emanation by heating to a definite temperature for a fixed interval of time is, under certain conditions, independent of the total amount of the emanation stored up in the compound. Suppose, for example, the emanation had been accumulating in a radium compound in the cold for an interval T. On' heating for a definite interval, e.g. from 2 to 4 hours, a certain quantity of emanation is released. On allowing the emanation to accumulate for a second interval T and then heating under the same conditions as before, the same quantity of emanation is again obtained, although the actual amount stored in the compound at the time of the second heating is much greater than in the first experiment. In explanation of these and other results of heating, Kolowrat suggests that the atoms of emanation formed in the radium preparation are not all held with the same degree of fixity. On heating the radium to a definite temperature, all those atoms of emanation which are lightly held in position are released and these constitute a definite fraction of the atoms produced. The residue of the atoms are so strongly held that they cannot be released until the temperature is increased further. If the emanation again accumulates in the cold, as in the case described above, a second heating under identical conditions releases the same definite fraction of the emanation accumulated in the interval, but has no effect on the part...
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Product details

  • Paperback | 228 pages
  • 189 x 246 x 12mm | 413g
  • United States
  • English
  • black & white illustrations
  • 1236875052
  • 9781236875051