Design and fabrication of a Nano-based neutron shield for fast neutrons from medical linear accelerators in radiation therapy

Table 1 Transmission factor comparison for mono-layer nanomaterial shields for Am-Be and linac spectra simulation (Uncertainties < 0.01)

Nano Material Concentration	Samples Thickness (cm)	Am-Be Spectrum (I/I₀)		Linac Spectrum (I/I₀)
Net Silicone	0.5	0.94		0.94
	1	0.91		0.87
	1.5	0.85		0.85
	2	0.82		0.76
	3	0.74		0.67
	4	0.67		0.59
	5	0.60		0.52
	Samples Thickness (cm)	Am-Be Spectrum (I/I₀)		Linac Spectrum (I/I₀)
	Samples Thickness (cm)	Fe₃O₄	B₄C	Fe₃O₄	B₄C
10% Wt. nano material, 90%Wt. silicone	0.5	0.95	0.94	0.93	0.93
	1	0.89	0.88	0.87	0.85
	1.5	0.85	0.83	0.82	0.80
	2	0.79	0.79	0.75	0.73
	3	0.71	0.69	0.66	0.63
	4	0.64	0.62	0.59	0.55
	5	0.58	0.55	0.51	0.49
20% Wt. nano material, 80%Wt. silicone	0.5	0.95	0.94	0.93	0.92
	1	0.88	0.88	0.87	0.84
	1.5	0.84	0.81	0.81	0.78
	2	0.79	0.76	0.75	0.72
	3	0.71	0.67	0.65	0.61
	4	0.63	0.59	0.57	0.53
	5	0.57	0.52	0.49	0.45
30% Wt. nano material, 70%Wt. silicone	0.5	0.94	0.93	0.93	0.92
	1	0.88	0.86	0.86	0.83
	1.5	0.83	0.80	0.79	0.76
	2	0.79	0.74	0.74	0.69
	3	0.70	0.64	0.64	0.58
	4	0.62	0.55	0.55	0.48
	5	0.55	0.48	0.49	0.40
40% Wt. nano material, 60%Wt. silicone	0.5	0.94	0.92	0.93	0.90
	1	0.87	0.84	0.85	0.81
	1.5	0.82	0.77	0.79	0.73
	2	0.77	0.71	0.73	0.66
	3	0.68	0.60	0.63	0.54
	4	0.60	0.50	0.54	0.44
	5	0.53	0.43	0.47	0.36
50% Wt. nano material, 50%Wt. silicone	0.5	0.94	0.91	0.93	0.89
	1	0.87	0.82	0.84	0.79
	1.5	0.81	0.75	0.77	0.71
	2	0.76	0.68	0.72	0.63
	3	0.67	0.57	0.62	0.51
	4	0.59	0.45	0.53	0.40
	5	0.51	0.39	0.45	0.33

ISSN: 1748-717X