Table 3.

Comparison of Monte Carlo simulated percentage depth dose curves with measured value

Field size (cm2)	PDD (10-cm depth)			PDD (20-cm depth)			Range at 50% dose (cm)
	Measured	MC calculated	Difference (%)	Measured	MC calculated	Difference (%)	Measured	MC calculated	Difference (%)
4×4	61.73	61.68	0.05	33.4	33.16	0.24	13.37	13.32	0.37
6×6	63.77	63.16	0.61	35.3	34.88	0.42	14.12	14.1	0.14
8×8	65.37	64.83	0.54	36.7	36.51	0.19	14.7	14.65	0.34
10×10	66.53	65.82	0.71	38.28	37.82	0.46	15.19	14.98	1.38
15×15	68.0	67.66	0.34	40.5	40.4	0.10	16	16.02	−0.12
20×20	69.53	69.08	0.45	42.4	41.9	0.50	16.7	16.44	1.56
30×30	70.87	70.49	0.38	44.19	43.66	0.53	17.56	17.5	0.34

MC: Monte Carlo, PDD: Percentage depth dose