考虑镉的屏蔽和探测箔的自身散射影响后的屏蔽，求出每一种探测箔在中能区各群的中子屏蔽因子，从而求得有效活化反应截面。
Neutron shielding factors of the foil are calculated for each group in intermediate energy range with detail consideration of cadmium filter and scattering by the foil itself.
在利用活化法进行中子能谱测量中，活化箔的多群截面是必须的输入参数之一。
The multiple group cross sections are indispensable when we want to obtain the neutron spectrum by multiple foil activation method.
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