Analysis of the activated background spectrum shows that natural copper is an ideal shielding material in fast neutron 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。
A high sensitive neutron monitor is described in this paper. It has an approximate counting rate of 20 CPM for natural background neutrons.
本文介绍了一种高灵敏度中子监测器，它对天然中子本底的计数率约每分钟20次计数。
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