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A comparative study of the effect of calibration conditions on the water equivalence of a range of gel dosimeters

Taylor, Michael, Franich, Rick, Trapp, Jamie, & Johnston, Peter (2007) A comparative study of the effect of calibration conditions on the water equivalence of a range of gel dosimeters. In Yu, B. (Ed.) 2007 IEEE Nuclear Science Symposium Conference Record. IEEE, Piscataway, NJ, USA, pp. 3170-3175.

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Abstract

Gel dosimeters are of increasing interest in the field of radiation oncology as the only truly three-dimensional integrating radiation dosimeter. There are a range of ferrous-sulphate and polymer gel dosimeters. To be of use, they must be water-equivalent. On their own, this relates to their radiological properties as determined by their composition. In the context of calibration of gel dosimeters, there is the added complexity of the calibration geometry; the presence of containment vessels may influence the dose absorbed. Five such methods of calibration are modelled here using the Monte Carlo method. It is found that the Fricke gel best matches water for most of the calibration methods, and that the best calibration method involves the use of a large tub into which multiple fields of different dose are directed. The least accurate calibration method involves the use of a long test tube along which a depth dose curve yields multiple calibration points.

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ID Code: 37732
Item Type: Book Chapter
Keywords: Radiotherapy, Gel dosimetry, Monte Carlo
DOI: 10.1109/NSSMIC.2007.4436800
ISBN: 1424409233
ISSN: 1082-3654
Subjects: Australian and New Zealand Standard Research Classification > PHYSICAL SCIENCES (020000) > OTHER PHYSICAL SCIENCES (029900) > Medical Physics (029903)
Divisions: Past > QUT Faculties & Divisions > Faculty of Science and Technology
Past > Schools > Physics
Copyright Owner: Copyright 2007 IEEE
Deposited On: 06 Oct 2010 10:20
Last Modified: 11 Aug 2011 03:47

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