镝活化法测量低产额脉冲中子  

Measurement of Low-Yield Pulse Neutron by Dy Activation

作　　者：王新华[1] 牟云峰[1] 安力[1] 郭海萍[1] 朱传新[1] 陈渊[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

出　　处：《原子能科学技术》2007年第5期533-536,共4页Atomic Energy Science and Technology

摘　　要：设计一个快中子聚乙烯慢化体,用来慢化加速器的d-T和d-D中子,利用^(164)Dy(n,γ)^(165)Dy^m在热中子区极高的反应截面,得到半衰期为75s的^(165)Dy^m,使用HPGe探测器测量^(164)Dy^m放出的γ射线。由于测得的γ射线与加速器的中子产额成一定比例,故通过这种方法可测量脉冲中子源的中子产额。A polyethylene moderator was designed for moderating d-T and d-D neutrons from neutron generator. The cross-section of ^164Dy（n,γ）^165Dy^m is very large for the thermal neutron, so that lots of ^165Dy^m are produced in the moderator. The half life of ^165Dy^m is 75 s, and it emits ample gamma rays. The gamma rays were measured by HPGe detector. The amount of T-ray is proportional to the neutron yield, hence the yield of pulse neutron source can be measured.

关 键 词：^164Dy(n γ)^165Dy^m 活化 中子产额 

分 类 号：O571[理学—粒子物理与原子核物理]