Table 2.

H/D values in the anatomical male phantom from Monte Carlo simulations (H/D_MC) with statistical uncertainties, analytical calculations (H/D_cal) and the absolute percentage differences between Monte Carlo and analytical predictions. These values were for a specific condition (an unmodulated 250 MeV proton beam incident upon a medium-sized closed aperture). Analytical model (new) is from this study, analytical model (old) is from Zheng et al (2007).

				Analytical model (new)		Analytical model (old)
Organs	d (cm)	d′ (cm)	H/DMC (mSv/Gy)	H/Dcal (mSv/Gy)	Diff (%)	H/Dcal (mSv/Gy)	Diff (%)
Brain	85.62	64.86	0.76 ± 0.04	0.34	54.76	0.89	16.95
Prostate	33.02	25.01	5.99 ± 0.088	5.98	0.00	5.98	0.00
Right lung	49.74	33.82	1.78 ± 0.082	1.72	3.76	2.64	47.92
Left lung	59.41	47.82	1.15 ± 0.056	0.95	17.34	1.85	60.28
Stomach	50.61	40.49	1.78 ± 0.051	1.50	15.65	2.55	43.44
Liver	40.46	28.01	2.59 ± 0.066	2.86	10.52	3.99	54.02
Colon	33.81	23.60	4.69 ± 0.081	4.43	5.65	5.71	21.64
Esophagus/thyroid	59.26	43.97	1.31 ± 0.06	1.02	22.35	1.86	41.36
Bladder	33.43	25.32	6.36 ± 0.089	5.57	12.39	5.84	8.22
Rectum	33.47	25.35	5.75 ± 0.085	5.61	2.45	5.82	1.26
Breast	50.59	35.68	2.01 ± 0.066	1.61	20.06	2.55	26.72
Gonads	36.54	28.05	4.36 ± 0.074	4.14	4.99	4.89	12.14