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利用自主研发的多球中子谱仪对北京市某室内环境中子能谱及剂量率进行了测量。从中子能谱获得了能量低于20MeV的环境中子注量率为2.83×10~(-3)cm~(-2)·s~(-1),估算出环境中子总注量率为3.54×10~(-3)cm-2·s~(-1);利用中子注量与周围剂量当量转换系数计算出了能量低于20MeV中子周围剂量当量率为(1.5±0.1)nSv/h,总中子周围剂量当量率为(2.1±0.1)nSv/h,与中子剂量仪测量值(2.3±0.2)nSv/h基本一致。该文测量结果与相近纬度比较相差不多,可以为评估北京室内环境中子剂量提供参考。
Using a multi-ball neutron spectrometer developed independently, a neutron spectrum and a dose rate of an indoor environment in Beijing were measured. From the neutron energy spectrum, the neutron fluence rate of energy less than 20 MeV was 2.83 × 10 -3 cm -2 · s -1, and the total neutron flux of environmental neutrons was estimated as 3.54 × 10 ~ (-3) cm -2 · s ~ (-1). The dose equivalent ratio of neutrons below 20MeV was calculated to be (1.5 ± 0.1) nSv by using the equivalent conversion coefficient between neutron flux and surrounding dose. / h. The dose equivalent ratio around the total neutrons was (2.1 ± 0.1) nSv / h, which was basically the same as that of the neutron dosimeter (2.3 ± 0.2) nSv / h. The results of this paper are similar to those of similar latitudes and can be used as a reference for evaluating neutron dose in Beijing indoor environment.