File:Radium, X rays and the living cell (1915) (14582069048).jpg

Identifier: radiumxrayslivin00colwrich (find matches)
Title: Radium, X rays and the living cell
Year: 1915 (1910s)
Authors: Colwell, Hector Alfred Russ, Sidney
Subjects: X-rays -- Physiological effect
Publisher: London, G. Bell and sons
Contributing Library: University of California Libraries
Digitizing Sponsor: MSN

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tion from an X-ray bulb the whole of the region traversedby the primary beam is seen to be filled with minute streaksand patches of cloud, a few due to secondary X rays appearingalso outside the primary beam. A photograph shows the cloudlets 32 THE NATURE OF X RAYS to be mainly small thread-like objects not more than a fewmillimetres in length, and many of them being considerablyless than ^\y mm. in breadth. Few of them are straight, someof them showing complete loops. Many of them show a peculiarbeaded structure. In addition to the thread-like cloudlets, thereare minute patches of cloud which may be merely foreshortenedthreads. Other fainter and more diffuse patches and streaksare also present, possibly representing older trails, in whichthe ions have had time to diffuse considerably before theexpansion. The droplets composing the threads have been depositedon the ions produced along the paths of the actually effectiveionising rays. These are probably of the nature of easily absorbed
Text Appearing After Image:
Fig. 7 secondary beta- or cathode rays ; some doubtless starting fromthe roof or floor of the cloud chamber, others, however (thelarger number when a limited horizontal beam of X rays isused), originating in the gas. The results are in agreement withBraggs view that the whole of the ionisation by X rays may beregarded as being due to beta- or cathode-rays arising from theX rays. Fig. 7 illustrates the ionisation in the track of an X ray ; thethread-like objects are ions upon which water vapour has con-densed, thus making them visible. It will be seen that theionisation appears to be due to some kind of very easil) deflectedradiation, e.g. cathode rays. AND THE lONISATION THEY PRODUCE 33 BIBLIOGRAPHY. 1. Marx, Annalen dev Physik, 1906, 1910 and 1911. 2. Franck and Pohl, Annalen der Physik, 1911. 3. Haga and Windt, Wied. Ann. Ixviii. p. 884, 1899. 4. Laue, Friedrich and Knipping, Annalen der Physik, 1913. 5. W. H. Bragg and W. L. Bragg, Proc. Roy. Soc. vol. 88, A. p. 428, 1913. 6. W. L.

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