Analysis of the activated background spectrum shows that natural copper is an ideal shielding material in fastneutron nuclear reactions.
通过分析天然铜的活化本底谱，可以看出它是快中子核反应中的最理想的屏蔽材料之一。
2
The intermediate and fastneutron 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。
3
To calculate burnup for the cores with fastneutronspectrum, we have written the linking codes to process the input and output of MCNP code and ORIGEN2 code.