Abstract
In radiation therapy, various radiation energies have been used according to the size and depth of tumor for therapeutic purpose. The electron energies are used for superficial treatments, whereas photon energies such as 6MV, 10MV and 18MV energy levels are utilized for the treatment of deeper tumors. The suitability of energy levels for treatment has been determined by dose distributions in water phantom. In this study, beam profiles of clinical linear accelerators for 10MV photon beams in water phantom were obtained by using Monte Carlo simulation program (MCSP) developed. MCSP was carried out taking into account the interactions of photons with matter in MATLAB (The Mathworks, Inc.). Monte Carlo simulation results were calculated for 5×5, 10×10 and 20×20cm2 field sizes at 5, 10 and 20cm depths for the dose profiles. In order to validate the beam profiles, Monte Carlo results were compared with experimental results for 1cm and 10cm depths at all the field sizes. MCSP results have shown a good agreement with experimental results.
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