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Speedup factor versus the number of tasks on an 80-core cluster for a 30 × 30 × 30 cm3 water phantom irradiated with a 18-MV photon beam of 10 × 10 cm2 field size. The number of voxels in the phantom were varied and mesh tally type 3 was used with 30 × 30 × 30 rectangular mesh superimposed on the phantom
