Measurement of correlated neutron distributions from an alpha-associated DT neutron generator
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摘要: 便携式α关联DT中子发生器在核物理实验、国土安全、核保障核查等领域有广泛应用价值。为检验某国产紧凑型便携式α关联DT中子发生器的关联中子分布参数性能，建立了关联中子分布参数测量装置，包括小型液闪探测器、精密位移装置和数字化符合测量仪；测量了两支中子发生器的关联中子区域范围以及对应立体角系数等数据。两支中子发生器的关联中子分布区域有一定差异，其关联区域面积相差约15%。此研究可为紧凑型便携式中子发生器的设计验证和出厂测试提供技术支持，也可为用户工程应用提供数据参考。Abstract:
Background Portable alpha-associated deuterium-tritium (DT) neutron generators have extensive application potential in fields such as nuclear physics experiments, homeland security, and nuclear safeguards and assay.Purpose To evaluate the correlated neutron distribution characteristics of a domestically developed compact portable alpha-associated DT neutron generator, providing critical technical support for its design validation, manufacturing quality control, and engineering applications.Methods A specialized measurement system was established, comprised of a liquid scintillator detector, a high precision displacement mechanics, and a coincidence measurement digitizer. This system was used to quantify the spatial extent of the correlated neutron emission region and the corresponding solid angle coefficients.Results Experimental measurements on two neutron generators revealed a measurable difference in their correlated neutron distribution areas, with an approximate 15% variation in the effective correlation region.Conclusions This study provides essential technical support for both the design validation and quality control testing in the manufacturing of this type of compact portable neutron generator. It also offers valuable reference data for engineering applications by end-users. -
图 6 关联中子分布测量机械装置图
Figure 6. Mechanical assembly diagram for correlated neutron distribution measurement
图 8 中子发生器的关联中子偏转角度
Figure 8. Deflection angles of correlated neutrons from the neutron generator
图 11 中子探测器信号幅度谱与PSD分辨图
Figure 11. Neutron detector signal amplitude spectra and PSD resolution plot
图 13 第一支中子发生器在X、Y方向的关联中子分布
Figure 13. Correlated neutron distribution along X and Y directions of neutron generator 1
图 14 第二支中子发生器在X、Y方向的关联中子分布
Figure 14. Correlated neutron distribution along X and Y directions of neutron generator 2
图 15 两支中子发生器X方向关联中子分布
Figure 15. X-direction correlated neutron distribution comparison (both two neutron generators)
图 16 两支中子发生器Y方向关联中子分布
Figure 16. Y-direction correlated neutron distribution comparison (both two neutron generators)
表 1 关联中子区域测量结果
Table 1. Measurement results of the correlated neutron region
No. X direction/mm Y direction/mm estimated area/mm2 solid angle coefficient/10−3 neutron intensity conversion factor #1 ±135 −140～120 5.51E+04 9.95 111.7 #2 −120～130 −100～150 4.91E+04 8.83 125.8 
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