基于反应堆中子照相孔道参数初步实验研究  

Preliminary Experimental Study on Parameters of Conduct for Neutron Photography Based on Reactors

作　　者：李义国[1] 鲁谨[1] 俞伯祥[2] 彭旦[1] 郝倩[1] 邹淑芸[1] 章爱武[2] 杨晓鹏[3] 

机构地区：[1]中国原子能科学研究院反应堆工程研究设计所,北京102413 [2]中国科学院高能物理研究所,北京100049 [3]北京航空航天大学,北京100191

出　　处：《原子能科学技术》2013年第B12期636-639,共4页Atomic Energy Science and Technology

基　　金：国家自然科学基金资助项目(11105160)

摘　　要：在医院中子照射器反应堆现有的水平热中子孔道的基础上,设计了一个适用于中子照相的热中子准直器。准直器入口2cm或4cm,出口直径为10cm,长度为115cm,最大准直比为58,偏移角为4.1°。对设计的热中子孔道进行了初步实验研究,结果显示,满功率运行时准直器出口处热中子注量率为1.0×106 cm-2·s-1,γ本底剂量率平均为11.65mSv/h,达到了热中子照相的要求。Based on the available thermal neutron beam of In-hospital Neutron Irradiator （IHNI）, a collimator was designed and constructed for the purpose of neutron radio- graphy. The diameter of the collimator entrance was 4 or 2 cm while the exit was 10 cm. The most collimation ratio was 58 and the divergence angle was 4.1°. The parameters of the neutron beam were studied by experiments. At full power of IHNI, the neutron fluence rate at the exit of the collimator is 1.0 × 10^6 cm^-2.s^-1 while the average 7 dose rate is 11.65 roSy/h, which could meet the requirement of neutron radiography.

关 键 词：中子照相 医院中子照射器 热中子注量率 

分 类 号：TL375[核科学技术—核技术及应用]