大空腔探测系统主动中子多重性反应系数模拟研究  

Simulation study of coupling for active neutron multiplicity counting on New Pile Laboratory—Neutron Multiplicity Counter

作　　者：董传江[1,2] 刘晓波[1] 陈利高[1,3] 谢奇林[1] 尹延朋[1] 徐家云[2] 

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621999 [2]四川大学物理科学与技术学院,成都610065 [3]清华大学工程物理系,北京100084

出　　处：《强激光与粒子束》2014年第3期229-234,共6页High Power Laser and Particle Beams

基　　金：中国工程物理研究院科学技术发展基金项目(2013B0103009)

摘　　要：为确定主动中子多重性反应系数对测量精度的影响,对大空腔探测系统主动中子多重性方法测量铀部件质量的全过程进行了直接模拟,基于MCNPX对28组相同浓缩度、相同密度、不同质量的内径1.2cm的半球壳型铀部件进行了模拟研究,获得了反应系数与样品增殖的关系曲线.对半球型、内径1.2 cm的半球壳型铀部件的模拟测量质量偏差都在1.5％以内,对内径3.2cm的半球壳型、半径6 cm和8 cm的圆柱型等形状差异较大的铀部件质量也仅偏小5％～10％.This paper describes all-process direct simulation of active neutron multiplicity counting on New Pile Laboratory—Neutron Multiplicity Counter(NPL-NMC).Twenty-eight hemispheroidal shell uranium components with an inner radius of 1.2cm were simulated by MCNPX code,which had different mass but the same enrichment and density.The relation curve between coupling and multiplication was obtained.The mass deviation of simulation measurement was within 1.5%for the hemispheroid and hemispheroidal-shell(inner radius 1.2cm)uranium components,while the mass deviation was lower 5%-10%for the hemispheroidal-shell(inner radius 3.2cm)and cylinder(inner radius 6,8cm)uranium components.

关 键 词：反应系数 中子多重性测量 高浓铀 大空腔探测系统 半球壳型铀部件 

分 类 号：TL816.9[核科学技术—核技术及应用]