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Table 3: Back-scattered dose perturbation factors versus distance from the interface for (a) 6 MV, (b) 10 MV (c), 15 MV, and (d) 20 MV photon beams

Table 3: Back-scattered dose perturbation factors versus distance from the interface for (a) 6 MV, (b) 10 MV (c), 15 MV, and (d) 20 MV photon beams