Radiography and Radio-Therapeutics; Radio-Therapeutics

Radiography and Radio-Therapeutics; Radio-Therapeutics

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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. 1918 edition. Excerpt: ... glass of these tubes, except in very special cases. The expulsion of an Alpha particle, however, causes the residue to coalesce into a further new body called Radium A, which by further consecutive changes rapidly gives rise to the series RaB, RaC1; and RaC2. 1 Always lower the reservoir when the mixture has passed over into the sparking tube, so that the gas is rarefied before sparking. In this way all risk of dangerous explosion is avoided. Fig. 365.--Apparatus for charging glass or other applicators with radium emanation after sparking. Now RaC (i.e. RaCj and RaC2 taken together) emits not only Alpha particles but also electrons (yS rays) and a highly penetrating radiation (7 rays), consisting of ether pulses of extremely short length. On this account Radium C is of the greatest importance therapeutically. The streams of electrons from it can easily penetrate the thin glass of the tube, but they are stopped by 1-6 cm. of aluminium or-4 cm. of lead. The 7 rays, on the other hand, are about a hundred times more penetrating. The above series of changes requires three hours for its completion, and at the end of that time the quantity of RaC has reached its equilibrium value. But from the moment of separation from the parent radium, the emanation itself decays by a process of disintegration till in 3-8 days only half of it is left. After a further 3-8 days half of what remained is gone, and so forth. It will be noticed that the actual amount which decays is proportional to the quantity present. For instance, if we have two volumes of emanation, one being twice the other, since both must become reduced to half their initial values by the end of 3-8 days, the amount of emanation which disappears from the former is twice what the other loses in the...
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Product details

  • Paperback | 94 pages
  • 189 x 246 x 5mm | 181g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 123652974X
  • 9781236529749