File:The American journal of roentgenology, radium therapy and nuclear medicine (1906) (14570751337).jpg

Identifier: americanjournroen09ameruoft (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: Gerstein - University of Toronto
Digitizing Sponsor: University of Toronto

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rimary focal raysand scattered rays within a limited angle;scattered rays coming from beyond thisangle are largely absorbed by the metalstrips. The conditions in each slit areduplicated in every other; hence if theeffectiveness of a single slit in reducing Roentgen Ray Society, Washington, D. C, Sept. 27-30, 1021. 58 The Efficiency of the Buck\-Diaphragm Principle 59 scattered radiation be determined, theresult holds for the whole diaphragm.The advantage of using a single slit inthis investigation is that its dimensionscan be varied easily as desired, whereas acomplete grid would be rather troublesometo alter in studying the effects of anychanges in its form and dimensions. will be slightly better than in the casewhere the film is below this level. Con-sequently in definition experiments withthe single slit arrangement the resultswill be slightly more favorable than wouldbe obtained with a complete grid asoperated in practical roentgenography,assuming equal slit width and slit depth L
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Fig. i A. Diagram illustrating experimental method; adisc of lead, L, is suspended over the tank of waterand intercepts a small portion of the primary raysfalling upon the film F through the slit S. The dottedlines show the angle within which scattered radiationmay fall upon the film. The effective depth of such a singleslit is the distance from its upper edgeto the photographic surface as illustratedin Figure iA. Such is not the case in acomplete Bucky grid, as shown in FigureiB, where the effective depth of the slit isthe depth of the lead strips. If in the lattercase the film were brought up into contactwith the lower edge of the grid, the effec-tiveness of the grid in removing scatteredradiation would not be changed; the condi-tions in each slit would then be independentof those of every other slit and would beidentical with the single slit arrangementas used in the present investigation. When the film itself is at the same levelas the bottom of the slit, the definition Fig. i B.

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