Modeling of a Linear Accelerator Saturne 43 and Study of Photon Dose Distributions (original) (raw)
— BEAMnrc is a widely used Monte Carlo (MC) code for simulation of photon and electron transport in the radiotherapy area. The aim of this study was to ameliorate a technique that changing the initial properties of incident electron beam as purpose to have the difference between calculated and measured values of doses produced by the linear accelerator (linac) Saturne 43 machine to be within 1.5%/1mm. We changed the initial electron energy and full width half maximum (FWHM) of the radius of the electron beam incident on the tungsten target to find the percentage depth dose(PDD), dose profile(DP) curves, the tissue-phantom ratio TPR 20/10 , the energy fluence distribution and angular distribution for a square field size 10×10 cm 2. The value of TPR 20/10 agrees well with the publisher related works, also w e c o u l d f i n d q u a n t i t a t i v e l y g o o d r e s u l t s w h i c h a g r e e w e l l w i t h experimental PDD and lateral profiles at 10 cm depth. M o r e o v e r , w e c o u l d r e d u c e the discrepancy between measured and calculated data photon dose distributions to be within 1.5%/1mm in the gamma index method for the energy 11.8 MeV and FWHM= 0.07 cm. Using BEAMnrc code on modeling and simulation of the treatment head of the Saturne 43 machine was successfully done altering the initial properties of electron source. That shows the efficacy and accuracy of the technique used in this paper to obtain the discrepancy within 1.5%/1 mm.
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