在中子周围剂量当量仪校准过程中,使用D-D中子源代替传统同位素中子源会使校准过程具有更高的安全性。为推动D-D中子源在中子周围剂量当量仪校准过程中的应用,提出了应用蒙特卡罗(MC)法的能量截断法代替影锥法的散射中子研究方法;分析了在不同类型房间中,不同内部空间尺寸对散射中子的影响。计算结果表明随着房间内部空间的增大,入射探测器的散射中子所占比例会逐渐减小。若使用D-D中子源进行中子周围剂量当量仪校准,在探测距离75cm,探测器直径20cm的情况下,所需的最小正方体房间的内部空间棱长为332cm;所需最小长方体房间的内部空间的长、宽、高分别为410cm、410cm、205cm。
Abstract
In the calibration process of neutron peripheral dose equivalent instrument, using D-D neutron source instead of traditional isotope neutron source will make the calibration process more secure. In order to promote the application of D-D neutron source in the calibration process of neutron peripheral dose equivalent instrument, the method of scattering neutron research using MC energy truncation instead of shadow cone method is proposes, and the influence of different internal space sizes on scattering neutron in different types of rooms is analyzed. The calculation results show that with the increase of the internal space of the room, the scattering neutron of the incident detector accounts for the proportion will gradually decrease. If the D-D neutron source is used for the calibration of the neutron peripheral dose equivalent instrument, when the detection distance is 75cm and the detector diameter is 20cm, the minimum cube room required is a cube room with an internal space of 332cm edge length; the minimum cube room required is a cuboid room with an internal space of 410cm in length, 410cm in width and 205cm in height.
关键词
计量学 /
D-D中子源 /
散射中子 /
中子周围剂量当量仪 /
校准校准
Key words
metrology /
D-D neutron source /
scattered neutron /
neutron ambient dose equivalent meter /
calibration
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基金
国家重大科学研究计划(2017YFF0104200);国家自然科学基金(41704171);国防基础科研项目(JCKY2018-401C001);江西省自然科学基金(20192BAB202009)
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