中子小角散射实验中放射性样品伴随γ抑制
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摘要
为抑制中子小角散射实验中伴随γ辐射的影响,研究弱散射能力中子辐照样品在不同实验条件下探测器获取的散射信号。结果表明:通过适当降低探测器的阳极工作电压,伴随γ辐射信号在全背底中的贡献比例降低,二维散射图谱环向均匀性大幅提升,散射信号的信噪比明显提高;根据辐照样品特性优选探测器阳极工作电压,可抑制伴随γ辐射的影响,改善样品的散射数据质量。
In order to reduce the influence of γ-ray in small angle scattering experiments, the measurements of γ signal and neutron scattering signal of irradiated specimens are performed at different states. The result shows: by properly decreasing anode voltage of detector,the contribution ratio of γsignal in the whole background is decreased,the circularly uniformity of the two-dimensional scattering patterns is improved,and the specimen's signal to noise ratio is obviously increased. To chose anode voltage by characteristics of samples,the influence of γ signal can be effectively suppressed,moreover,the quality of the SANS curve is significantly improved.
In order to reduce the influence of γ-ray in small angle scattering experiments, the measurements of γ signal and neutron scattering signal of irradiated specimens are performed at different states. The result shows: by properly decreasing anode voltage of detector,the contribution ratio of γsignal in the whole background is decreased,the circularly uniformity of the two-dimensional scattering patterns is improved,and the specimen's signal to noise ratio is obviously increased. To chose anode voltage by characteristics of samples,the influence of γ signal can be effectively suppressed,moreover,the quality of the SANS curve is significantly improved.
引文
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[3]Meslin E.Characterization of neutron-irradiated ferritic model alloys and a RPV steel from combined APT,SANS,TEM and PAS analyses[J].Journal of Nuclear Materials,2010,406:73-83.
[4]黄朝强,闫冠云,谢雷,等.同步辐射小角散射法和中子衍射法研究中子辐照Al-B合金结构[J].核技术,2014,37(9):13-18.
[5]Chen Liang,Sun Liangwei,Wang Yun,et al.Small-angle neutron scattering spectrometer suanni equipped with ultra-thin biconcave focusing lenses[J].Journal of Applied Crystallography,2016,49:1388-1393.
[6]Peng M,Sun Liangwei,Chen Liang,et al.A new small-angle neutron scattering spectrometer at China Mianyang research reactor[J].Nuclear Instrument and Methods in Physics Research A,2016,810:63-67.
[7]黄朝强,宋建明,陈波,等.中子三轴谱仪二维位置灵敏探测器标定[J].核技术,2013,36(12):34-38.
[8]Keiderling U.The new‘Ber SANS-PC’software for reduction and treatment of small angle neutron scattering data[J].Applied Physics A 74(Suppl.),2002,1455-1457.
[9]Lindner P,Zemb T.Neutron,X-ray and Light:Scattering methods applied to soft condensed matter[M].Elsevier Science B.V,2002,23-48.