混合压片型241AmO2-Be中子源物理特性研究  

Study of Physical Characteristics for Compressed-Mixture Type ^(241)AmO_2-Be Neutron Source

作　　者：李永明[1] 陈金象[1] 张国辉[1] 樊铁栓[1] 

机构地区：[1]北京大学核物理与核技术国家重点实验室,北京100871

出　　处：《原子能科学技术》2013年第1期1-6,共6页Atomic Energy Science and Technology

基　　金：国家重点基础研究发展计划资助项目(2009GB107001,2008CB717803,2007CB209903);高等学校博士学科专项科研基金资助项目(200610011023)

摘　　要：Am-Be中子源是应用广泛的同位素中子源,国际上为其建立了ISO 8529-1推荐标准。为检验该标准的普适性和各种应用的需求,本文以德国PTB实验室ISO源和北京大学核物理与核技术国家重点实验室的国产同类源为例,对源中子从产生到出射的物理过程进行蒙特卡罗模拟和理论计算。综合评述了源的制作和结构差异等因素对源中子能谱、平均能量、1.5 MeV以下中子的份额、源强、源发射4.438MeVγ射线与中子的强度比和出射中子的各向异性等源自身物理特性的细致影响。The standard spectrum was recommended in the ISO 8529-1 according to PTB experimental measurements for Am-Be neutron source. In order to verify its universality, the processes of neutron production for the PTB ISO source and a China-made source were theoretically calculated and simulated by Monte-Carlo method. The detailed influences from different manufacturing parameters on physical characteristics of sources, such as neutron spectrum, average neutron energy, fraction of neutrons below 1.5 MeV, source strength, 4.438 MeV γ-ray to total neutron ratio and emission anisotropy were discussed and reviewed.

关 键 词：Am-Be中子源 中子能谱 源物理特性 蒙特卡罗模拟 

分 类 号：O517.53[理学—低温物理]