MONTE CARLO SIMULATION OF 6, 10 AND 18 MV PHOTON BEAM DOSE DISTRIBUTION IN A BRAIN TUMOR

This study aimed to obtain the absorbed dose distribution in a heterogeneous head simulator object where brain tumor of 2 cm diameter was located. Materials equivalent and were created. For simulation, elemental composition (H, C, N, O, others) mass density ρ respectively used. X-ray spectra 6, 10 18 MV used for exposures, projecting field 3×3 cm2 tumor, with an isocentric source distance 100 cm. Monte Carlo simulations done PENELOPE v.2008 code. The results show that maximum skin is 32 %, 20 % 14 skull 88 74 62 67% 73 energies respectively. received by tissues decreases increasing energy, while increases energy.