铀钚溶液设备外中子探测效率研究

Study on the Neutron Detection Efficiency of Uranium-Plutonium Solution System

中子探测技术作为一种非破坏性分析技术,是铀钚溶液系统钚含量监测的一个较好的选择。基于典型的盛放铀钚溶液的圆柱形设备和典型的热中子探测器,开展了设备外中子探测效率研究,以实现对铀钚溶液系统的钚含量监测。对探测器的位置、慢化体及屏蔽体布置、料液浓度和料液分段对探测响应计数的影响进行了研究,获得了优化的探测效率以及不同轴向段对探测器响应的贡献,并通过钚溶液样品验证实验的中子计数率实测值,验证了中子探测效率的理论计算,两者符合良好。铀钚溶液系统中子探测效率研究,可以应用于后续铀钚溶液设备的钚浓度监测研究中,为设备钚浓度监测技术方案设计提供参考,为后续钚浓度监测算法研究奠定基础。

As a non-destructive assay technique,neutron detection technology is a better choice for monitoring the plutonium concentration of the uranium-plutonium solution system.A study on the neutron detection efficiency of uranium-plutonium solution system is carried out to monitor the plutonium concentration of the system,based on a typical cylindrical equipment containing uranium-plutonium solution and a typical thermal neutron detector.The effects of detector position,moderator and shield configuration,solution concentration and solution axial profile on the detection response were studied,and the optimized detection efficiency and the contribution of different axial sections to the detector response were obtained.The theoretical value of the neutron detection efficiency was verified by the measured value of the neutron count rate of the plutonium solution sample,and they were in good agreement.The study on neutron detection response of the uranium-plutonium solution system can be applied to the later monitoring of the plutonium concentration of the uranium-plutonium solution equipment,which provides a reference for the design of the technical monitoring scheme of the plutonium concentration of the equipment and lays a foundation for the subsequent study of the plutonium concentration monitoring algorithm.