PMID: 2497318Mar 1, 1989Paper

Output calibration in solid water for high energy photon beams

Medical Physics
C S Reft

Abstract

The AAPM Protocol recommends the use of water, polystyrene or acrylic media for measuring the output of high energy photon beams. It provides the appropriate restricted mass stopping powers and mass energy absorption coefficients for converting the dose to these media to dose to water. A water-equivalent solid has been developed for dosimetric applications [C. Constantinou, F. Attix, and B. Paliwal, Med. Phys. 9, 436 (1982)]. Calculated values for the restricted mass stopping powers and mass energy absorption coefficients have been published for this material [A. Ho and B. Paliwal, Med. Phys. 13, 403 (1986)]. The accuracy of these calculations was investigated by making output measurements, following the Protocol, with a Farmer type chamber in four materials for Co-60, 4, 6, 10, 18, and 24 MV photon beams. The results show that the scaled dose to water for the different media agree to better than 1%, and the analysis supports the methodology of the Protocol for obtaining the dose to water from the different media.

Citations

May 2, 2003·Medical Physics·Indrin J ChettyAlex F Bielajew
Mar 4, 2014·Physics in Medicine and Biology·Robin HillClive Baldock
Aug 21, 2008·Journal of Applied Clinical Medical Physics·Ramani RamaseshanRobert Heaton
Aug 17, 2011·Journal of Applied Clinical Medical Physics·Dale W LitzenbergDon A Roberts

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