地层元素n-γ测井中LaBr_3:Ce探测器响应数值蒙卡模拟
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摘要
随着地层元素测井的发展,提高探管中探测器分辨率是技术人员研发重点之一。近年来,LaBr_3:Ce闪烁探测器凭借优良响应性能逐渐在中子测井领域推行。基于蒙特卡洛方法,对比分析了LaBr_3:Ce、NaI和BGO探测器对不同能量γ射线的沉积谱,并建立地层测井模型,采用D-T脉冲中子源和LaBr_3:Ce探测器对H、O、C、Fe等地壳元素γ特征能谱进行分析,设置4组晶体尺寸观测探测效率的变化。模拟结果表明:LaBr_3:Ce和BGO探测器能量响应明显优于NaI探测器,LaBr_3:Ce特征峰相对探测效率最高,因此进行常见地层元素分析时选择LaBr_3:Ce晶体。
With the development of formation element logging, it is one of the key points for technicians to improve the resolution of detectors in the probe. In recent years, the LaBr_3:Ce scintillation detector has been gradually implemented in the field of neutron logging with excellent response performance. Based on the Monte Carlo method, the sedimentary energy spectra of LaBr_3:Ce and NaI detectors are compared and analyzed. The formation logging model is established. The energy spectra of hydrogen H and Fe are observed by D-T pulse neutron source and two kinds of detectors. The simulation results show that the LaBr_3:Ce detector has higher calculation accuracy than the NaI detector when the interference of various formation elements is overlapped when measuring common formation elements. The LaBr_3:Ce high resolution crystal is in the complex formation. The detection efficiency in elemental logging is higher.
With the development of formation element logging, it is one of the key points for technicians to improve the resolution of detectors in the probe. In recent years, the LaBr_3:Ce scintillation detector has been gradually implemented in the field of neutron logging with excellent response performance. Based on the Monte Carlo method, the sedimentary energy spectra of LaBr_3:Ce and NaI detectors are compared and analyzed. The formation logging model is established. The energy spectra of hydrogen H and Fe are observed by D-T pulse neutron source and two kinds of detectors. The simulation results show that the LaBr_3:Ce detector has higher calculation accuracy than the NaI detector when the interference of various formation elements is overlapped when measuring common formation elements. The LaBr_3:Ce high resolution crystal is in the complex formation. The detection efficiency in elemental logging is higher.
引文
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[4]吉朋松,庄人遴,林谦,等.双BGO晶体能谱测井[J].核电子学与探测技术,1997,17(2):116-119.
[5]岳爱忠,王树声,何绪新,等.FEM地层元素测井仪研制[J].测井技术,2013,37(4):411-416.DOI:1004-1338(2003)04-0411-06.
[6]Van L,Dorenbos P,Van E,et al.Scintillation properties of LaBr3:Ce3+crystals:fast,efficient and high-energy-resolution scintillators[J].Nuclear Instruments and Methods in Physics Research Section A:Accelerators,Spectrometers,Detectors and Associated Equipment,2002,486(1/2):254-258.DOI:10.1016/S0168-9002(02)00712-X.
[7]Van L,Dorenbos P,Van E,et al.High-energy-resolution scintillator:Ce3+activated LaCl3[J].Applied Physics Letters,2001,79(10):1573-1575.DOI:10.1063/1.1308053.
[8]阳林峰,庹先国,张金钊,等.En自然γ铀矿测井LaBr3晶体探测效率的MC模拟[J].核电子学与探测技术,2013,33(9):1156-1159.
[9]丁言国,包汉波,李正国,等.LaBr3:Ce晶体生长及物理特性的研究[J].硅酸盐通报,2014,33(3):476-481.DOI:1001-1625(2014)03-0476-06.
[10]周鹏飞.基于蒙特卡罗方法的脉冲中子地层多元素测井研究[D].江西:东华理工大学,2017.
[11]彭凤梅.复合材料对14 MeV中子源屏蔽的M-C模拟研究[D].江西:东华理工大学,2012.
[12]罗鹏.D-T反应中子源准直屏蔽体及中子束特性研究[D].兰州:兰州大学,2009.
[13]曹琴琴.D-D和D-T中子源中子照相慢化准直屏蔽系统模拟设计[D].兰州:兰州大学,2006.