| 1.4MeV-5MeV中子诱发~(238)U裂变产额测量 |
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| 引用本文： | 李映映,肖军,王攀,李子越,汪超,罗小兵.1.4MeV-5MeV中子诱发~(238)U裂变产额测量[J].核电子学与探测技术,2016(2):218-221. |
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| 作者姓名： | 李映映 肖军 王攀 李子越 汪超 罗小兵 |
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| 作者单位： | 1. 四川大学原子核科学技术研究所,成都,610064;2. 中国工程物理研究院中子物理学重点实验室,绵阳,621900 |
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| 基金项目： | 中物院中子物理学重点实验室开放课题(2014 BA06)资助。 |
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| 摘 要： | ~(238)U裂变产额测量工作在核数据测量中有着重要意义,本工作利用2.5MeV质子静电加速器产生的1.4MeV-5MeV单能中子诱发238U裂变,通过对裂变产物放射性的测量对裂变产物核素~(135)I、~(133)I、~(105)Ru和~(91)Sr的产额进行了测定。照射过程中中子通量用活化法确定。分析了影响实验测量的多个因素,包括用MCNPX程序对中子在靶头及样品中的多次散射和自屏蔽效应进行了修正,对γ射线在样品中的自吸收进行修正等。得到产额数据典型误差为3.5%,最后把测量结果与已有的裂变产额数据进行比对。
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| 关 键 词： | 238 U 裂变产额 活化法测中子注量 |
Fission Product Yield Measurement of 238 U Induced by 1.4-5 MeV Neutrons |
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| Abstract: | 238 U fission yield measurement has a significant meaning in nuclear data measurement .This thesis a-dopts1.4 MeV-5 MeV mono -energetic neutrons generated by 2.5 MeV proton electrostatic accelerator to stimulate 238U fission, and then measures the yield of fission product nuclide 135I、133I、105Ru and 91Sr through measuring fission product radioactivity .Neutron flux during irradiation process is determined by activation meth-od .Subsequently , this thesis analyzes multiple components influencing experiment measurement , including cor-rection on neutron′s multiple scattering and self -shielding effect in target head and sample on the basis of MC-NPX program as well as correction on sample′s self-absorption of γ-ray.Typical deviation of yield data is concluded as 3.5%.Finally, this thesis compares measurement consequences with existing fission yield data . |
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| Keywords: | 238 U fission yield activation technique |
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