Monte Carlo Simulation Of Theratron Equinox 80 60co Radiotherapy Unit

The BEAMnrc Monte Carlo package is used to simulate the 60Co beam from thernTheratron Equinox 80" 60Co radiotherapy unit. In modeling the 60Co unit a particularrnattention has been paid for the geometry and material construction of the 60Co sourcerncapsule, source housing, and the collimator assembly. The inrnuence of eld size onrntotal photon spectra, scattered photon and electron spectra, (which is produced fromrnthe photon interaction with the materials surrounding the Cobalt source and collimatorrnassembly), at the phantom surface (SSD equal to 80 cm) are studied. From our simulationrnthe variation of total photon and scattered photon spectra with increasing eld size isrncaused by scattered photons from di erent parts of the 60Co radiothereapy unit. We alsornused BEAMnrc generated phase space les as beam source for DOSXYZnrc to calculaternthe percentage depth dose and compared with measured values

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