PMID: 9547498Apr 21, 1998Paper

A new approach to electron-beam reference dosimetry

Medical Physics
D W O Rogers

Abstract

A new approach is proposed for electron-beam dosimetry under reference conditions and data necessary to use this approach are presented. The approach has the following features; it uses ion chambers and starts from an absorbed-dose calibration factor for 60Co to be consistent with the present proposal for the new AAPM photon-beam protocol; it uses R50 to specify the beam quality and the reference depth, dref = 0.6R50 - 0.1 (all quantities in cm), recommended by Burns et al. [Med. Phys. 23, 383-388 (1996)]; it has a formalism which is parallel to the kQ formalism for photon-beam dosimetry; it fully accounts for the impact on stopping-power ratios of realistic electron beams; it allows an easy transition to using primary standards for absorbed dose to water in electron beams when these are available. The equation for dose to water under reference conditions is; DWQ = MPionPgrQk'R50kecalND,w60Co. The term PgrQ is not needed with plane-parallel chambers but corrects for gradient effects with cylindrical chambers and is measured in the user's beam. The parameter kecal is associated with converting the 60Co absorbed-dose calibration factor into one for an electron beam of quality Qe and contains most of the chamber to chamber variati...Continue Reading

References

Sep 1, 1992·Medical Physics·D W Rogers
May 1, 1992·Physics in Medicine and Biology·P AndreoT Kraepelien
Jan 1, 1988·Medical Physics·M A HuntA Buffa

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Citations

Feb 28, 2003·Medical Physics·Ernesto Mainegra-HingD W O Rogers
Nov 22, 2007·Physics in Medicine and Biology·R P KapschE Schüle
Jul 29, 2006·Medical Physics·Lesley A Buckley, D W O Rogers
Nov 27, 2004·Nihon Hoshasen Gijutsu Gakkai zasshi·Hiroshi Oguchi
Jun 5, 2002·Physics in Medicine and Biology·G ChristE Schüle

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