2007
DOI: 10.1088/0031-9155/53/1/006
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Effect of scatter material on diode detector performance forin vivodosimetry

Abstract: The accuracy of Scanditronix EDE, EDP10 and EDP20 diodes for entrance dosimetry of complex fields has been assessed using static and dynamic multileaf collimator test fields on phantoms. Specifically, surrounding scatter material size and composition have been investigated. The EDP10 and EDP20 diodes incorporate steel build-up caps. The effect of varying the diameter of the wax scatter discs on the dosimeter response showed a systematic detector under-response for the smaller discs with errors up to 4.1% relat… Show more

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Cited by 3 publications
(1 citation statement)
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“…This results in a slower decrease of the electron fluence compared with a water equivalent detector as the field size decreases below the threshold for lateral electron equilibrium (Westermark et al 2000) and a subsequent over-response of the diode in small fields (Haryanto et al 2002, Heydarian et al 1996. There will be a similar effect due to the density of the diode housing also being greater than that for water (Best et al 2008), the most common housing material being epoxy (ρ epoxy = 1.2 g cm −3 ). A further small contribution to the over-response of the diode may arise from the increase in electron stopping power of silicon relative to water with increasing electron energy (Heydarian et al 1996).…”
Section: Response Of Diodes At Small Field Sizesmentioning
confidence: 99%
“…This results in a slower decrease of the electron fluence compared with a water equivalent detector as the field size decreases below the threshold for lateral electron equilibrium (Westermark et al 2000) and a subsequent over-response of the diode in small fields (Haryanto et al 2002, Heydarian et al 1996. There will be a similar effect due to the density of the diode housing also being greater than that for water (Best et al 2008), the most common housing material being epoxy (ρ epoxy = 1.2 g cm −3 ). A further small contribution to the over-response of the diode may arise from the increase in electron stopping power of silicon relative to water with increasing electron energy (Heydarian et al 1996).…”
Section: Response Of Diodes At Small Field Sizesmentioning
confidence: 99%