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Standardization of Cesium-137 Gamma-Ray Sources in Terms of Exposure Units (Roentgens)

Authors
  • Loftus, T. P.
Type
Published Article
Journal
Journal of Research of the National Bureau of Standards. Section A, Physics and Chemistry
Publisher
National Institute of Standards and Technology
Publication Date
Jan 01, 1970
Volume
74A
Issue
1
Pages
1–6
Identifiers
DOI: 10.6028/jres.074A.001
PMID: 32523164
PMCID: PMC6753037
Source
PubMed Central
Keywords
Disciplines
  • Physics and Chemistry
License
Unknown

Abstract

137Cs γ -ray sources, which have been proposed by the Public Health Service as a substitute for radium in the treatment of malignant diseases, require suitable calibration if consistency is to be achieved in radiation treatment. Several 137Cs sources were calibrated using a graphite cavity ionization chamber in an open-air geometry. The contribution of scatter from the room surfaces was calculated and the source measurements corrected for this effect. A large-volume aluminum-walled ionization chamber was designed and fabricated for use in routine calibrations. This chamber will be used as a means for intercomparison of the source to be calibrated with one of the standards.

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