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March 2019

The Dosimetry of Beta Radiations1

Journal/Book: Reprinted from RADIOLOGY Vol. 62 No. 1 Pages 74-82 January 1954. 1954;

Abstract: ROBERT LOEVINGER Ph.D 1From the Physics Laboratory and Department of Radiotherapy Mt. Sinai Hospital New York N. Y. Presented at the Thirty-eighth Annual Meeting of the Radiological Society of North America Cincinnati Ohio Dec. 7-12 1952. SUMMARY The dosimetry of beta radiation from small sources is shown to depend upon knowledge of the distribution of absorbed energy around a point source of beta particles. The difficulty of making a direct determination of this quantity is discussed. Equations are given for determining this "point source energy distribution function" from measurements an very thin plane beta sources. The results of such measurements an six beta-emitting isotopes are given in the form of a two-part equation. Comparison of this theoretical result with the experimental points is shown in the form of graphs. The theory represents the measurements closely from very small distances out to the end of the beta range. ___MH

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