Identifier: americanjournalo10ameruoft (find matches)
Title: The American journal of roentgenology, radium therapy and nuclear medicine
Year: 1906 (1900s)
Authors: American Radium Society American Roentgen Ray Society
Subjects: Radiotherapy X-rays
Publisher: Springfield, Ill. C.C. Thomas
Contributing Library: Internet Archive
Digitizing Sponsor: Internet Archive

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rter exposure. The spark-gap was determined by a pointto point measurement at the beginning ofthe investigation, and the reading of thelow tension \oltmeter obserxed. At allsubsequent experiments, the machine wasset to give the same voltmeter reading,regardless of what the point gap mightbe. This gap measurement was found tovary from 5 to 534 in. on different days.A sphere-gap used at the beginning of thework showed a definite sparking o^er or 9 in. has been used. In order to comparethe effect of a 5 in. back-up, a dog ofmedium size was given a dose of 200 ma.min. over each flank. Areas 33^ in. squarewere used, and the remainder of the dogsbody was shielded with lead foil. On thethird day, this animal refused food anddeveloped a diarrhea. On the morning ofthe fifth day it was found dead in its cage.Autopsy revealed the condition shown mFigure i. Several loops of small bowelshowed dilatation and a smoothing outof the normal convolutions. There wasalso a marked hvperemia made out in the
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-5 ami 50 ma. min. .^ ..-- ,5 ma. mm, S5 ma. min. 100 ma. mm. 150 ma. min. Fig. 2. Photographs of the skin reactions observed following the administration of various doses. Wherethe reactions are absent or faint, the exposed square is outlined with a skin pencil. when adiusted to a reading of -^ peak kv.with the machine running at the settingjust described. All experiments were performed with asecondary current of lo ma. read on 3milliammeters of different makes connectedin series. These instruments checked eachother within I4 ma. at this reading. Atarget-skin distance of 10 in. was usedthroughout the in\-estigation. In all the published work coming to ourattention in which fatal doses have beendelivered to animals, a parallel gap of 8 affected loops, and, in places, the intestinalwall showed definite thinning. The worstlesions were in the duodenum. This patho-logical picture is practically the same asthat described by Warren and \\hipplein experiments in which the higher voltageswere

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