Build up region of megavoltage photon radiation sources

D. E. Velkley, D. J. Manson, J. A. Purdy, G. D. Oliver

Research output: Contribution to journalArticlepeer-review

107 Scopus citations

Abstract

Measurements of surface dose and build up have been measured for photon radiation sources with maximum energy from 1.2 to 25 MeV. A variable volume ionization chamber was used and the results extrapolated to what would be obtained with a zero volume chamber. The results are found to depend systematically on the plate separation of a parallel plate ionization chamber and an empirical method was derived for correcting measurements made with a fixed volume chamber. The relationship of dose build up curves with skin reactions in radiation therapy patients is discussed.

Original languageEnglish
Pages (from-to)14-19
Number of pages6
JournalMedical physics
Volume2
Issue number1
DOIs
StatePublished - Jan 1975

Keywords

  • 48.510
  • BIOLOGICAL RADIATION EFFECTS
  • BUILDUP
  • GAMMA DOSIMETRY
  • GAMMA SOURCES
  • RADIATION DOSES
  • RADIOTHERAPY
  • SKIN
  • X=(HYPHEN)=RAY DOSIMETRY
  • X=(HYPHEN)=RAY SOURCES

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