MONTE CARLO Simulation of Photon Beams for Various Effects on Energy and Angular Distribution using PRIMO

Abstract

The Monte Carlo code PENELOPE has been used tosimulate different models of LINACS with the presence andabsence of air and variation of radius of ring using PRIMO formedical applications. The patient model is selected as waterphantoms and its dimension is 16.20*16.20*31.00 with bin size of0.25 cm having source to phantoms surface distance (SSD)100cm. For that Nominal energy is set at 6 MV with initialenergy 5.900 MeV. The field geometry is set at 20*20 withparameter X1, X2, Y1, Y2 as 10 cm. Implication from thesimulation shows that the effect of air is only in the Elekta modelof LINACS. There is also a large variation in the energy due tochange in radius of ring of LINACS