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Figure 2: Monte Carlo calculated photon fluence spectrum for field sizes (a) 5 cm × 5 cm (b) 10 cm × 10 cm (c) 15 cm × 15 cm (d) 20 cm × 20 cm (e) 25 cm × 25 cm

Figure 2: Monte Carlo calculated photon fluence spectrum for field sizes (a) 5 cm × 5 cm (b) 10 cm × 10 cm (c) 15 cm × 15 cm (d) 20 cm × 20 cm (e) 25 cm × 25 cm