Table 2. Dose caused by trapped particles based on different thicknesses of three layers of protection layers in MCNP and MULLASSIS codes

MCNPX code	MULLASSIS code	Thickness of the last layer (polyethylene): (mm)	Thickness of the middle layer (water): (mm)	Thickness of the first layer (aluminum): (mm)	Simulation mode
Total absorbed dose in second (10–4 rad)	Total absorbed dose in second (10–8 rad)
0.98047	13.2687	0.90	0.10	0.60	A
0.97859	08.7412	0.80	0.20	0.60	B
0.97885	11.0617	0.70	0.30	0.60	C
0.96935	13.6729	0.60	0.40	0.60	D
0.98026	10.3674	0.50	0.50	0.60	E
0.99776	15.0460	0.45	0.55	0.60	F
0.97994	10.2768	0.40	0.60	0.60	G
0.97457	09.7853	0.30	0.70	0.60	H
0.97146	09.3227	0.20	0.80	0.60	I
0.97143	08.4544	0.10	0.90	0.60	J
0.97256	09.5570	0.00	1.00	0.60	K