基于~(10)B_4C转换体的多层多丝正比室中子探测器模拟
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摘要
随着国内高通量中子源及中子散射谱仪的快速发展,对高探测效率、高位置分辨、低伽玛灵敏度的位置灵敏型热中子探测器需求日益迫切。目前国际上中子散射谱仪大多数采用了基于~3He的热中子探测器,由于当前~3He价格昂贵,寻求~3He替代型热中子探测器的相关研究任务紧迫。提出了一种基于~(10)B_4C转换体的多层多丝正比室新型二维位置灵敏型热中子探测器,并利用蒙特卡罗模拟软件Geant4和Garfield++对其探测效率、位置分辨、n/γ抑制比等性能展开了详细的模拟研究。结果表明,当多丝正比室单元为40层,阈值为200 keV时,热中子(E=0.025 eV)探测效率可达到～54%,位置分辨为2.6 mm (FWHM),n/γ抑制比为～10~7,可以满足大多数中子散射谱仪的需求,为此类探测器设计及实验研究提供了理论依据。
As the development of high flux neutron sources and neutron scattering spectrometers in China,more and more neutron detectors with high detection efficiency, high position resolution, high time resolution and low gamma sensitivity are need ungently.~3 He based neutron detector is one of the best options. Recently, because of the ~3He gas shortage and its expensive price, we must find a new replacement of ~3He. A two-dimensional position sensitive neutron detector based on multi-layer Multi Wires Proportional Chambers(mMWPC) with ~(10)B_4C converter was proposed in this paper. The neutron detection efficiency, position resolution and γ compression were simulated with Geant4 and Garfield++. The results show that with 40 layers of neutron convertor, high themal neutron(E = 0.025 eV) detection of ～54%, best position resolution of 2.6 mm(FWHM) and high n/γrejection ratio of ～10~7 with the threshold of 200 keV can be achieved, which can meet the requirements of most spectrometers. This simulation results lay a good foundation for the next step of detector construction and test.
As the development of high flux neutron sources and neutron scattering spectrometers in China,more and more neutron detectors with high detection efficiency, high position resolution, high time resolution and low gamma sensitivity are need ungently.~3 He based neutron detector is one of the best options. Recently, because of the ~3He gas shortage and its expensive price, we must find a new replacement of ~3He. A two-dimensional position sensitive neutron detector based on multi-layer Multi Wires Proportional Chambers(mMWPC) with ~(10)B_4C converter was proposed in this paper. The neutron detection efficiency, position resolution and γ compression were simulated with Geant4 and Garfield++. The results show that with 40 layers of neutron convertor, high themal neutron(E = 0.025 eV) detection of ～54%, best position resolution of 2.6 mm(FWHM) and high n/γrejection ratio of ～10~7 with the threshold of 200 keV can be achieved, which can meet the requirements of most spectrometers. This simulation results lay a good foundation for the next step of detector construction and test.
引文
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[3]CHEN Hesheng.Modern Physics,2016,38(1):3.(in Chinese)(陈和生.现代物理知识,2016,38(1):3.)
[4]KOUZES R T,ELY J H,ERIKSON L E,et al.Nucl Instr and Meth A,2010,623(3):1035.
[5]WANG Yanfeng,SUN Zhijia,ZHOU Jianrong,et al.Science China Physics,Mechanics and Astronomy,2013,56(10):1987.
[6]JEFFREY L,ATHANASIADES A,SUN Liang,et al.IEEE Nuclear Science Symposium Conference Record[C].Orlando:IEEE,2009:119.
[7]XIE Zhaoyang,ZHOU Jianrong,SONG Yushou,et al.Nucl Instr and Meth A,2018,888:235.
[8]WANG Xiaohu,ZHU Qiming,CHEN Yuanbo,et al.Nuclear Electronics and Detection Technology,2009,29(4):756.(in Chinese)(王小胡,朱启明,陈元柏,等.核电子学与探测技术,2009,29(4):756.)
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[10]Available on the web http://garfieldpp.web.cern.ch/garfieldpp.
[11]VAN DER ENDE B M,ATANACKOVIC J,ERLANDSONA,et al.Nucl Inst Meth A,2016,820:40.
[12]VAN DER ENDE B M,RAND E T,ERLANDSON A,et al.Nucl Instr and Meth A,2018,894:138.
[13]JAMIL M,RHEE J T,KIM H G,et al.Applied Radiation and Isotopes,2015,95:90.
[14]ANDERSEN K,BIGAULT T,BIRCH J,et al.Nucl Instr and Meth A,2013,720:116.
[15]Available on the web http://www.srim.org/.
[16]NELSON K A,BELLINGER S L,BENJAMIN W,et al.Nucl Instr and Meth A,2012,669:79.
[17]NAKAMURA T,KAWASAKI T,HOSOYA T,et al.Nucl Instr and Meth A,2012,686:64.