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.
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。
Analysis of the activated background spectrum shows that natural copper is an ideal shielding material in fast neutron nuclear reactions.
描述了裂变源、微型裂变室、中子探测器、实验安排以及降低测量本底的措施。
Detailed descriptions of the fission neutron sources, the ionization chamber for fission fragment detection, the neutron detectors and the experimental arrangement are given.
用屏蔽法检验了散射本底中子影响，高阈能探测器本底中子的影响很小。
The experimental-shielding method is used to proof-test the fraction of scattered background neutrons, and for high-threshold detectors, the influence of background neutrons is very small.
用屏蔽法检验了散射本底中子影响，高阈能探测器本底中子的影响很小。
The experimental-shielding method is used to proof-test the fraction of scattered background neutrons, and for high-threshold detectors, the influence of background neutrons is very small.
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