The beam quality index and output factors and absolute point dose show good agreement with measurements. Results: Gamma analysis shows a minimum pass percentage of 99% for depth dose curves and 95.4% for beam profiles. The gamma analysis method with the acceptance criteria of 2%, 2 mm was used for the comparison of dose distributions. The PRIMO simulation model of Clinac ®iX was also validated against Eclipse ® Acuros XB dose calculations in the case of both homogenous and inhomogeneous mediums. The simulated beam parameters were compared against the measured beam data of the Clinac ®iX machine. Materials and Methods: The modeling of Clinac ®iX linear accelerator has been carried out by using PRIMO simulation software (Version 0.). Purpose: This study aims to model 6MV photon of Clinac ®iX linear accelerator using PRIMO Monte Carlo (MC) code and to assess PRIMO as an independent MC-based dose verification and quality assurance tool.
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