A Novel and High-Precision Method for Calculating the γ-Ray Build-Up Factor for Multilayer Shields

Table 3

The partial RAD results.

Material of shields	Average deviation (%)	Maximum deviation (%)	Maximum deviation point ((MeV),[mfp1]…[mfpn])	Deviation >10 (%)
Al	2.20	19.31	(10, 0.141)	2.31
Fe	2.24	15.22	(10, 0.043)	0.69
Pb	1.71	12.71	(10, 9.870)	0.31
Al + Pb	2.65	20.21	(0.5, 4.489, 0.119)	1.27
Fe + Pb	2.48	22.18	(10, 0.022, 0.214)	1.64
Pb + Al	3.51	22.92	(10, 4.974, 0.281)	4.08
Al + Fe + Pb	3.05	20.24	(0.5, 3.218, 3.478, 0.186)	3.63
Fe + Pb + Al	2.83	19.32	(10, 1.755, 3.492, 0.214)	1.69
Pb + Al + Fe	2.90	21.30	(1, 2.195, 0.0796, 0.0538)	2.77
Al + Fe + Pb + Fe	2.69	17.50	(0.5, 2.233, 1.332, 0.143, 0.394)	1.54
Fe + Pb + Fe + Al	3.19	24.44	(0.6, 1.411, 2.468, 0.253, 0.078)	3.54
Pb + Al + Fe + Al	3.27	17.87	(0.5, 2.079, 0.419, 0.198, 2.074)	2.92