天然中子是人类所受天然辐射中环境贯穿辐射的重要组成部分。为对天然中子造成的居民剂量进行准确评估,需要得到天然中子的能谱分布信息,为此利用中子多球谱仪对西藏自治区的一些地点进行了实际测量。多球谱仪的中子探测器选用内充4个大气压、直径为5cm的3He管,选用的 Natural neutrons are an essential part of the natural radiation through which human beings experience natural radiation. In order to accurately estimate the resident dose caused by natural neutrons, we need to get the information about the distribution of the energy spectrum of natural neutrons. For this purpose, some locations in the Tibet Autonomous Region are measured by neutron multi-sphere spectrometer. Multi-ball spectrometer neutron detector used within the filling 4 atm, diameter 5cm 3He tube, the choice of