Characterization of a 6 MV photon beam in terms of primary and scattered dose components

 

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dc.contributor.advisor Hering, E R en_ZA
dc.contributor.advisor Nieto-Camero, Jaime en_ZA
dc.contributor.author Trauernicht, Christoph Jan en_ZA
dc.date.accessioned 2014-07-28T11:10:08Z
dc.date.available 2014-07-28T11:10:08Z
dc.date.issued 2009 en_ZA
dc.identifier.citation Trauernicht, C. 2009. Characterization of a 6 MV photon beam in terms of primary and scattered dose components. University of Cape Town. en_ZA
dc.identifier.uri http://hdl.handle.net/11427/2801
dc.description.abstract The purpose of this work was to partition the 6 MV photon beam of a Philips SL75-5 linear accelerator into primary and scattered dose components in water. The two quantities that are necessary to define the primary beam component are a reference dose DR and a primary linear attenuation coefficient μ 0. DR describes the magnitude of the primary dose as a fraction of the total dose in a reference field at a reference depth, while μ 0 describes how the primary dose changes with depth in a medium. The scattered component is the difference between the primary and total dose. μ 0 for the beam in water was determined in four different ways, namely through the extrapolation of measured TMRs to zero field size, through linear attenuation measurements, through the fit of a convolution model to CAPDD data and through a method involving a central axis attenuator. The primary dose component was determined in two ways, namely by the extrapolation of the phantom scatter correction factor to zero field size and also by the central axis attenuator method. μ 0 varied from 0.0445 cm-1 to 0.0469 cm-1 with an average of 0.0455 +- 0.0012 cm-1. DR for a 10 cm x 10 cm field at the depth of maximum dose was found to vary between 0.933 Gy/ 100 MU and 0.935 Gy/ 100 MU, with an average of 0.934 Gy/ 100 MU. These values agree very well with values published in the literature. It has thus been shown that the 6 MV photon beam is separable into primary and scattered dose components. en_ZA
dc.language.iso eng en_ZA
dc.subject.other Medicine en_ZA
dc.title Characterization of a 6 MV photon beam in terms of primary and scattered dose components en_ZA
dc.type Thesis / Dissertation en_ZA
uct.type.publication Research en_ZA
uct.type.resource Thesis en_ZA
dc.publisher.institution University of Cape Town
dc.publisher.faculty Faculty of Health Sciences en_ZA
dc.publisher.department Division of Medical Physics en_ZA
dc.type.qualificationlevel Masters en_ZA
dc.type.qualificationname MSc en_ZA
uct.type.filetype Text
uct.type.filetype Image


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