基于NPL-NMC系统的γ测量子系统的建模与优化  

Modeling and Optimization of Gamma Measurement Subsystem Based on NPL-NMC System

作　　者：张昌繁[1] 陈利高[1,2] 刘晓波[1] 龚建[1] 

机构地区：[1]中国工程物理研究院核物理与化学研究所,四川绵阳621900 [2]清华大学工程物理系,北京100084

出　　处：《原子能科学技术》2016年第4期698-704,共7页Atomic Energy Science and Technology

摘　　要：在军控核查中,核部件的质量、丰度、年龄属性需采用无损方法进行核查,NPL-NMC系统是一套利用中子多重性测量核部件质量属性的装置,为建立完善的属性测量系统,还需在NPL-NMC系统的基础上建立γ测量子系统。本文通过设计γ测量子系统在NPL-NMC系统上的布局及对中子屏蔽的优化,使系统能对铀部件的丰度、年龄属性进行测量。模拟计算结果表明,该γ测量子系统能很好地满足军控核查对铀部件丰度、年龄属性测量的要求。The non-destructive analysis is usually employed to measure attributes of mass,isotopic ratio and age for nuclear component in arm control and verification scenario.The NPL-NMC system was developed with making use of neutron multiplicity principle for measuring mass attribute of plutonium and HEU in arm control and verification scenario.To build a comprehensive verification system for nuclear component,attributes of isotopic ratio and age for plutonium and HEU needed to be confirmed by the non-destructive gamma measurement.Therefore,agamma measurement sub-system based on the NPL-NMC system was modeled and the neutron shield for protecting the gamma system from neutron damage was optimized.The isotopic ratio and age attributes for HEU could be analyzed.The calculation result indicates that it is effective for attribute measurement for isotopic ratio and age of HEU,which satisfies the requirement of establishing an integrate attribute measurement system in arm control and verification scenario.

关 键 词：NPL-NMC系统 γ测量 中子屏蔽 高浓铀 丰度属性 年龄属性 

分 类 号：TL99[核科学技术—核技术及应用]