The multiple group cross sections are indispensable when we want to obtain the neutron spectrum by multiple foil activation method.
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 intermediate and fast neutron flux spectrum in the core of the swimming-pool reactor is measured by multiple foil activation method.
用活化箔技术测定游泳池反应堆内中能中子与快中子通量谱。
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