溴化镧(LaBr_3:Ce) γ谱仪前端读出电子学电路
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摘要
设计了一种结构简单、噪声低、功耗小的溴化镧(LaBr_3:Ce)γ谱仪前端读出电子学电路。该电路包括电压灵敏前置放大电路、谱仪放大电路和供电电源3部分,电路的设计基于传统核电子学方法和较新的电子元器件,采用低噪声设计技术,在能谱测量中获得了较高的能量分辨率。文中首先介绍了电路的设计方案,包括各部分电路原理、功能和设计要点;然后开展了电路仿真和电路板设计;最后通过实验进行电路功能验证。实验表明:基于研制的前端读出电子学电路、溴化镧(LaBr_3:Ce)探测器及数字多道分析器组成的γ谱仪系统,对~(137)Cs 662 keV γ能峰的能量分辨率可达2.7%,谱仪系统性能稳定。
A front-end readout electronics circuit of LaBr_3:Ce γ spectrometer with simple structure,low noise and low power consumption is designed.Based on the traditional method of nuclear electronics,the circuit designed with new electronic components and low noise technology consists of voltage sensitive preamplifier circuit,spectroscopy amplifier circuit,and power supply.First,the design of the circuit including the principles,functions,and key design points of each part is introduced.Then,the circuit simulation and the circuit board fabrication are carried out.Finally,the circuit function is verified through experiments.The results show that the energy resolution of the LaBr_3:Ce γ spectrometer for ~(137)Cs 662 keV energy peak can reach 2.7%,and the system performance is stable.
A front-end readout electronics circuit of LaBr_3:Ce γ spectrometer with simple structure,low noise and low power consumption is designed.Based on the traditional method of nuclear electronics,the circuit designed with new electronic components and low noise technology consists of voltage sensitive preamplifier circuit,spectroscopy amplifier circuit,and power supply.First,the design of the circuit including the principles,functions,and key design points of each part is introduced.Then,the circuit simulation and the circuit board fabrication are carried out.Finally,the circuit function is verified through experiments.The results show that the energy resolution of the LaBr_3:Ce γ spectrometer for ~(137)Cs 662 keV energy peak can reach 2.7%,and the system performance is stable.
引文
[1]马飞,魏义祥,文向阳.一种用于溴化镧探测器的小型多道采集电路[J].核电子学与探测技术,2009,29(5):1 179-1 182.(MA Fei,WEI Yi-xiang,WEN Xiang-yang.A multichannel data acquisition circuit for LaBr3detector[J].Nuclear Electronics&Detection Technology,2009,29(5):1 179-1 182.)
[2]肖无云,毛用泽,艾宪芸,等.手持式γ谱仪用核辐射探测器综述[J].核电子学与探测技术,2008.(SHENG Liang,QIUMeng-tong,HEI Dong-wei,et al.Effect of temporal-spatial response function of detector on signal-to-noise[J].Nuclear Electronics&Detection Technology,2009,28(5):974-977)
[3]ALEXIEV D,MO L,PROKOPOVICH D A,et al.Comparison of LaBr3:Ce and LaCl3:Ce with NaI(Tl)and Cadmium Zinc Telluride(CZT)detectors[J].IEEE Transs on Nucl Sci,2008.
[4]ALZIMAMIl K,ABUELHIA E,PODOLYAK Z,et al.Characterization of LaBr3:Ce and LaCl3:Ce scintillators for gamma-ray spectroscopy[J].Journal of Radioanalytical&Nuclear Chemistry,2008,278(3):755-759.
[5]谷钲伟,闫文奇,刘文斌,等.溴化镧、碘化钠和塑料闪烁探测器性能比较[J].实验室研究与探索,2015,34(4):64-69.(GU Zheng-wei,YAN Wen-qi,LIU Wen-bin,et al.Comparison of performance of lanthanum bromide,sodium iodide and plastic scintillator detectors[J].2015,34(4):64-69.)
[6]ZHANG Hai-wei,WANG Lei,LENG Feng-qing.et al.Properties and application studies of LaBr3(Ce)scintillation detector[J].Spectroscopy and Spectral Analysis,2017,37(7):2 298-2 304.
[7]HIGGINS W M,GLODO J,LOEF E V,et al.Bridgman growth of LaBr3:Ce and LaCl3:Ce crystals for high-resolution gamma-ray spectrometers[J].Journal of Crystal Growth,2006,287(2):239-242.
[8]KOZYREV A,MITROFANOV I,OWENS A,et al.A comparative study of LaBr3(Ce3+)and CeBr3based gamma-ray spectrometers for planetary remote sensing applications[J].Rev of Sci Instrum,2016,87(8):1 573.
[9]QUARATI F G A,DORENBOS P,BIEZEN J V D,et al.Scintillation and detection characteristics of high-sensitivity CeBr3,gamma-ray spectrometers[J].Nucl Instrum Methods Phys Res A,2013,729:596-604.
[10]SHAH K S,GLODO J,KLUGERMAN M,et al.LaBr3:Ce scintillators for gamma ray spectroscopy[C]//IEEE Nuclear Science Symposium Conference Record,2002:92-95.
[11]清华大学工程物理系核电子学研究室.核电子学讲义[M].北京:2011:94.(Department of Engineering Physics,Tsinghua University.Nuclear Electronics Lecture[M].Beijing:2011:94.)
[12]马场清太郎.运算放大器应用电路设计[M].北京:科学出版社,2007:251-254.(SEITARO B.Application Circuit Design of Operational Amplifier[M].Beijing:Science Press,2007:251-254)
[2]肖无云,毛用泽,艾宪芸,等.手持式γ谱仪用核辐射探测器综述[J].核电子学与探测技术,2008.(SHENG Liang,QIUMeng-tong,HEI Dong-wei,et al.Effect of temporal-spatial response function of detector on signal-to-noise[J].Nuclear Electronics&Detection Technology,2009,28(5):974-977)
[3]ALEXIEV D,MO L,PROKOPOVICH D A,et al.Comparison of LaBr3:Ce and LaCl3:Ce with NaI(Tl)and Cadmium Zinc Telluride(CZT)detectors[J].IEEE Transs on Nucl Sci,2008.
[4]ALZIMAMIl K,ABUELHIA E,PODOLYAK Z,et al.Characterization of LaBr3:Ce and LaCl3:Ce scintillators for gamma-ray spectroscopy[J].Journal of Radioanalytical&Nuclear Chemistry,2008,278(3):755-759.
[5]谷钲伟,闫文奇,刘文斌,等.溴化镧、碘化钠和塑料闪烁探测器性能比较[J].实验室研究与探索,2015,34(4):64-69.(GU Zheng-wei,YAN Wen-qi,LIU Wen-bin,et al.Comparison of performance of lanthanum bromide,sodium iodide and plastic scintillator detectors[J].2015,34(4):64-69.)
[6]ZHANG Hai-wei,WANG Lei,LENG Feng-qing.et al.Properties and application studies of LaBr3(Ce)scintillation detector[J].Spectroscopy and Spectral Analysis,2017,37(7):2 298-2 304.
[7]HIGGINS W M,GLODO J,LOEF E V,et al.Bridgman growth of LaBr3:Ce and LaCl3:Ce crystals for high-resolution gamma-ray spectrometers[J].Journal of Crystal Growth,2006,287(2):239-242.
[8]KOZYREV A,MITROFANOV I,OWENS A,et al.A comparative study of LaBr3(Ce3+)and CeBr3based gamma-ray spectrometers for planetary remote sensing applications[J].Rev of Sci Instrum,2016,87(8):1 573.
[9]QUARATI F G A,DORENBOS P,BIEZEN J V D,et al.Scintillation and detection characteristics of high-sensitivity CeBr3,gamma-ray spectrometers[J].Nucl Instrum Methods Phys Res A,2013,729:596-604.
[10]SHAH K S,GLODO J,KLUGERMAN M,et al.LaBr3:Ce scintillators for gamma ray spectroscopy[C]//IEEE Nuclear Science Symposium Conference Record,2002:92-95.
[11]清华大学工程物理系核电子学研究室.核电子学讲义[M].北京:2011:94.(Department of Engineering Physics,Tsinghua University.Nuclear Electronics Lecture[M].Beijing:2011:94.)
[12]马场清太郎.运算放大器应用电路设计[M].北京:科学出版社,2007:251-254.(SEITARO B.Application Circuit Design of Operational Amplifier[M].Beijing:Science Press,2007:251-254)