基于扩展型多球中子谱仪的中子能谱测量
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摘要
为了有效地测量加速器辐射场的中子能谱,论文通过FLUKA模拟的辐射场中子能谱和探测器能量响应选择出合适的扩展型多球中子谱仪、利用基于少道解谱理论的解谱程序来得到实验能谱以及积分注量统计。并通过计算与实验计数率的对比证明了该方法测量中子能谱的可行性,同时分析了实验的不足并给出了改进的建议。
To measure the neutron energy spectrum of accelerator radiation field effectively,suitable ERBSS( Extended Range Neutron Multi-sphere Spectrometer) was selected according to the neutron field spectrum and energy response simulated by FLUKA,and the experiment spectrum and integration fluence was worked out by unfolding program based on the " few-channel" unfolding theory. The feasibility of using this method for spectrum measurement was verified through comparison between the calculation and the experimental count rate.The defects of the experiment were analyzed and recommendations for improvement were given.
To measure the neutron energy spectrum of accelerator radiation field effectively,suitable ERBSS( Extended Range Neutron Multi-sphere Spectrometer) was selected according to the neutron field spectrum and energy response simulated by FLUKA,and the experiment spectrum and integration fluence was worked out by unfolding program based on the " few-channel" unfolding theory. The feasibility of using this method for spectrum measurement was verified through comparison between the calculation and the experimental count rate.The defects of the experiment were analyzed and recommendations for improvement were given.
引文
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[2]谢一冈,陈昌,王曼,等.粒子探测器与数据获取[M].北京:科学出版社,2003:192-205.
[3]Wiegel B,et al.Spectrometry using the PTB neutron multisphere spectrometer(NEMUS)at flight altitudes and at ground level[J].Nuclear Instruments&Methods in Physics Research,2002,476(01):52–57.
[4]Wiegel B,Alevra V.NEMUS—the PTB Neutron Multi-sphere Spectrometer:Bonner spheres and more[J].Nuclear Instruments&Methods in Physics Research,2002,476(s 1–2):36-41.
[5]Tripathy S P,et al.Measurement of241Am–Be spectra(bare and Pb-covered)using TLD pairs in multi-spheres:Spectrum unfolding by different methods[J].Nuclear Instruments&Methods in Physics Research,2009,598(2):556-560.
[6]徐勇军,刘森林,吴建华,等.西藏自治区天然中子能谱测量[J].中国原子能科学研究院年报,2012:234-245.
[7]陈军,李春娟,李玮,等.多球谱仪测量BNCT医院中子照射器中子束能谱[J].原子能科学技术,2014,48(11):2128-2132.
[8]Agosteo S,Bedogni R,Caresana M.Characterization of extended range Bonner Sphere Spectrometers in the CERF high-energy broad neutron field at CERN[J].Nuclear Instruments and Methods in Physics Research A,2012,694:55-68.
[9]Bedogni R,et al.Measurement of neutron spectra generated by a 62AMe V carbon-ion beam on a PMMA phantom using extended range Bonner sphere spectrometers[J].Nuclear Instruments&Methods in Physics Research,2012,681(14):115.
[10]Ferrari A,Sala P R,Fasso A,et al.FLuka:A Multi-particle Transport Code[M].CERN-2005_010,INFN TC_05/11,SLAC-R-773,2005.
[11]Wang Panfeng,Ding Yadong.Simulation of the response functions of an extended range neutron multisphere spectrometer using FLUKA[J].Chinese Physics C,2015,9(7)):3076001.
[12]中国国家标准化委员会.GB/T 14055.1-2008中子参考辐射第1部分:辐射特性和产生方法[S].北京:中国标准出版社,2008.
[13]中国国家标准化委员会.GB/T 14055.2-2012中子参考辐射第2部分:与表征辐射场基本量相关的辐射防护仪表校准基础[S].北京:中国标准出版社,2008.