A theoretical re-examination of Spencer-Attix cavity theory

Physics in Medicine and Biology
Hugo Bouchard

Abstract

The aim of radiation dosimetry is to evaluate, under specific conditions, absorbed dose in a medium of interest using a detection device. In comparison to what is meant to be evaluated, the distinctive composition of the detector causes particle fluence perturbation and shifted absorbed-dose response, both effects depending on beam quality. For electron and megavoltage photon beams, Spencer-Attix cavity theory further adapted by Nahum remains the accepted standard method used to convert absorbed dose in a wall-less detector to absorbed dose in the medium of interest. For several decades, the approach has been widely used in protocols to generate data for ionization chamber dosimetry. As a considerable effort was made towards accurate Monte Carlo methods, computation techniques are nowadays available to determine absorbed dose accurately in complex geometries, including radiation detectors. In the development of nonstandard beam protocols, direct Monte Carlo dose calculations using realistic models are being suggested and used to generate data for ionization chamber dosimetry. This indicates that for a general dosimetric context, including nonstandard beams, a more general cavity theory in agreement with what is currently being ...Continue Reading

References

Jan 1, 1978·Physics in Medicine and Biology·A E Nahum
Apr 1, 1991·Physics in Medicine and Biology·C M Ma, A E Nahum
Oct 1, 1966·The British Journal of Radiology·T E Burlin
Nov 1, 1994·Physical Review. a·Y K Kim, M E Rudd
May 2, 2003·Medical Physics·D W O Rogers, Iwan Kawrakow
Mar 15, 2006·Medical Physics·Lesley A Buckley, D W O Rogers
Jun 9, 2007·Medical Physics·Lilie L W Wang, David W O Rogers
Dec 17, 2008·Medical Physics·R AlfonsoS Vatnitsky
Nov 26, 2009·Medical Physics·Hugo BouchardIwan Kawrakow

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Citations

Jan 7, 2014·Medical Physics·Edmond SterpinHugo Bouchard
Mar 3, 2012·Medical Physics·Hugo BouchardHugo Palmans
Oct 3, 2015·Medical Physics·Hugo BouchardHugo Palmans
Aug 9, 2017·Journal of Applied Clinical Medical Physics·Per H HalvorsenLynne A Fairobent
Aug 14, 2015·Physics in Medicine and Biology·Hugo BouchardSimon Duane
Jan 14, 2021·Physics in Medicine and Biology·Hugo Bouchard
Oct 7, 2021·Medical Physics·Günther H HartmannKlemens Zink

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