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Figure 1: Schematic diagram of the Board of Radiation and Isotope Technology ^{192}Ir highdose rate source simulated in the EGSnrc Monte Carlo code. Dimensions shown are in millimeters (not to scale). (b) The cartesian coordinate system, P(R,Z) used in the EGSnrc simulations. The coordinate of P will be (r,θ) in polar coordinate system. The origin of the coordinate system is chosen at the center of the active source 
