Printing ISSN 2519-9749
Treatment planning using Monte Carlo (MC) code is widely used to improve different equipments used in radiation therapy. This real simulation technique is becoming more practical in Medical Physics, particularly with the rapid development of computer technology. Such simulation requires accurate detailed knowledge of radiation beams as well as the accurate construction of medical linear accelerators (Linacs). In the present work the dosimetric properties of 9-MeV electron beam of the Varian Clinac 2100C/D Linac were investigated. The dosimetric features of interest are, the central-axis absorbed dose, the beam profiles, the photon, electron and positron fluences and energy fluences, the mean energy, the spectral distribution, and the isodose curves. The above mentioned Linac was simulated using OMEGA BEAMnrc MC code system to produce 10x10cm phase space of electron beam. The detailed spectra of the phase-space files resulted from the present simulation and that provided by the International Atomic Energy Agency (IAEA) for the electron beam of 10cmx10cm field of view were modeled, simulated and finally analysed using BEAMdp. The central axis depth-dose curves, dose profiles and isodose curves of the electron beams in water phantom were also scored and analysed using DOSXYZnrc, STATDOSE and DOSXYZ_SHOW code. This study demonstrates that the MC code system can create the phase space data files which can be used to generate accurate MC dose distributions for electron beams produced using clinical high energy Linacs in water phantom or in patients for the sake of radiation therapy.