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

Table 2

The variation range of the shield layer.

Shield layer	Total MFP of shield layer	Energy of incident photons (MeV)
Al	[0, 10]	{0.5, 0.6, 0.8, 1, 1.5, 2, 3, 4, 5, 6, 8, 10}
Pb + Fe	[0, 10]	{0.5, 0.6, 0.8, 1, 1.5, 2, 3, 4, 5, 6, 8, 10}
Fe + Al + Pb	[0, 10]	{0.5, 0.6, 0.8, 1, 1.5, 2, 3, 4, 5, 6, 8, 10}
Al + Fe + Pb + Fe	[0, 10]	{0.5, 0.6, 0.8, 1, 1.5, 2, 3, 4, 5, 6, 8, 10}