File:Journal of roentgenology (1919) (14570945367).jpg

Identifier: journalofroentge2191west (find matches)
Title: Journal of roentgenology
Year: 1919 (1910s)
Authors: Western Roentgen Society
Subjects: Radiology
Publisher: Iowa City, Iowa : Western Roentgen Society, 1918-1919
Contributing Library: The College of Physicians of Philadelphia Historical Medical Library
Digitizing Sponsor: The College of Physicians of Philadelphia and the National Endowment for the Humanities

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l emanation has been forced past cock 16.By again opening cock 20, the mercury from vessel 21 forcesthe purified emanation up into the left branch of 17 andthence out into the capillary tube 18. As the difference inlevel of the mercury in 21 and in 18 is only a few centi-meters, the emanation is under reduced pressure, and uponheating the capillary tube with a fine flame, the glass sof-tens, falls together and the tiny emanation tube can bedrawn off without loss of emanation. The next day thesame procedure is repeated to secure the emanation, whichhas meanwhile accumulated. The capillary tube containingthe radium emanation under reduced pressure can be di-vided into the desired number of smaller tubes by the care-ful use of a tiny flame. When just prepared, the emanation tubes have little betaor gamma ray activity. As the decay products Ra A, Ra Band Ra C are formed, the beta and gamma ray activityincreases, until a maximum is reached about three and a 332 THE JOUENAL OP ROENTGENOLOGY
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IMfJURR II EMANATION FROM RADIUM — VIOL 333 half hours after the emanation has been placed in the tube.See table I. After this beta-gamma ray activity decreasesat practically the same rate at which the emanation is de-caying, half of any activity being lost in 3.85 days. Where it is desired to use the active deposit for appli-cation of the rays or for injection of a radioactive solution,the emanation is passed into a special glass vessel whichis sealed on to the apparatus at 17. For an applicator thelead or metal plate which is to be activated is so exposedin the vessel as to permit the active deposit to form on thedesired surface. When a solution is to be prepared, finelypowdered salt is placed in the vessel. Emanation is ad-mitted to the vessel for three to four hours to permit themaximum of active deposit forming. The emanation is thenremoved from the vessel by suitable manipulation, and theglass vessel is removed. The solution of active deposit isprepared by dissolving the salt

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