Monte Carlo investigations of radiotherapy beams: studies of conventional, stereotactic and unflattened beams

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http://eprints.org/relation/isVolatileVersionOf http://etheses.bham.ac.uk/id/document/1731 http://eprints.org/relation/ispreviewThumbnailVersionOf http://etheses.bham.ac.uk/id/document/1731 http://eprints.org/relation/isVersionOf http://etheses.bham.ac.uk/id/document/1731 archive 4031 disk0/00/00/07/08 2010-05-28 10:52:11 2019-01-23 09:52:41 2011-07-19 16:22:07 thesis show 0 Jaafar Sidek Mohamed Ariff Hugtenburg Richard Green Stuart University of Birmingham Monte Carlo investigations of radiotherapy beams: studies of conventional, stereotactic and unflattened beams unpub QC 10col_ephy Monte Carlo modelling is a useful method of investigating the electron and photon transport in radiotherapy linear accelerators. The probability of interactions of the materials stored in the cross-section library is considered to be theoretically accurate. Calculations made by Monte Carlo techniques have many roles including investigation of unusual situations where measurements are difficult and as a problem solver. The predictions made by a validated model can be used to confirm an assumption or prove a hypothesis. This study is aimed to investigate the performance of the DOSI detector, a prototype detector which is position sensitive with submillimeter resolution. This solid-state detector is made of p-type diode has silicon material as its volume element. Work from other authors has shown that other silicon detectors overestimate the dose as field size and depth increase. To overcome this, a mechanism for correction has to be determined. For this reason, this investigation compares experimental data and calculated results using Monte Carlo method at 6 MV photon energy from a Varian linear accelerator. A small degree of perturbation has been found from this study, and work on improvement of the dose measurements has been carried out. Results have been presented and suggestion for a better dose meter is discussed. 2010-07 2010-01 graduation eng author unchecked This unpublished thesis/dissertation is copyright of the author and/or third parties. The intellectual property rights of the author or third parties in respect of this work are as defined by The Copyright Designs and Patents Act 1988 or as modified by any successor legislation. Any use made of information contained in this thesis/dissertation must be in accordance with that legislation and must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the permission of the copyright holder. public 243 University of Birmingham School of Physics and Astronomy d_ph FALSE na 2010-07 graduation