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。
A high sensitive neutron monitor is described in this paper. It has an approximate counting rate of 20 CPM for natural background neutrons.
还应用外置伽玛源和中子源进行了实验，以判断本底的来源。
Some external neutron and gamma source experiments were carried out to study the origin of the background.
按照模拟计算，实验大厅薄气隙室周围的主要本底是中子和光子。
According to a simulation, the main source of the background around TGC in the experimental hall is neutrons and photons.
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