用于核保障中核材料衡算的液体闪烁体中子多重性测量装置

本工作优化设计建立了1套可用于核保障中核材料衡算的液体闪烁体中子多重性测量装置,并基于该装置开展了性能测试。结果表明,装置运行状态稳定,各项指标均在可接受范围内。同时开展了对²⁵²Cf源和标准Pu样品的实验室模拟测量等中子多重性测量研究。结果表明,该测量装置的探测效率好于15%,测量相对标准偏差为8.6%,表明在条件允许时,通过长时间信号采集,该中子多重性测量装置有能力替代基于³He管的中子多重性测量装置,通过中子多重性分析完成核保障中核材料衡算定量测量任务。

Liquid Scintillation Detector Based Neutron Multiplicity Counting Device for Nuclear Material Accountancy in Nuclear Safeguard

Liquid scintillation detector based neutron multiplicity counting device for nuclear material accountancy in nuclear safeguards was optimal designed and established, and some related performance tests were also carried out in this work, which indicates the operating state of this device is stable and all the indications are acceptable. Meanwhile, some related researches for neutron multiplicity counting have been done, which included the simulated measurements in the laboratory for ²⁵²Cf source and plutonium standards. The experimental results show that the detection efficiency of this device is better than 15%, and the relative standard deviation of measurements is 8.6%. It proves that this new neutron multiplicity counting device has capability to take place of ³He detector based neutron multiplicity counting device by long-time signal collection in allowed condition, and accomplish the quantification tasks for nuclear material accountancy in nuclear safeguards by neutron multiplicity analysis.