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Figure 3: Comparison of depth dose distribution of rectangular fi eld 6 × 4 cm and equivalent circular field R = 2.4 cm and equivalent square field 4.4 × 4.4 cm at 15 MeV

Figure 3: Comparison of depth dose distribution of rectangular fi eld 6 × 4 cm and equivalent circular field R = 2.4 cm and equivalent square field 4.4 × 4.4 cm at 15 MeV