基于MCNP模拟和实验的1×1英寸的LaBr3(Ce)闪烁体探测器的特性研究
发布时间:2025-02-07 16:41
在核物理中,伽马探测技术被广泛应用于伽马光谱学中。闪烁体探测器广泛应用于医疗、工业、能源和环境等领域,其中Nal(T1)闪烁体探测器在过去的50年中得到了广泛的应用。最近,新的镧系闪烁体特别是LaBr3(Ce)闪烁体因其高的发光效率及快的响应时间成为新型辐射探测材料的研究热点。本论文主要采用理论模拟及实验研究的方法,建立LaBr3(Ce)闪烁体探测器,计算半高宽(FWHM)、能量分辨率、γ能谱的全能峰效率等性能参数。基于蒙特卡罗(MCNP)中探测器模型,采用F8来记录探测器中产生的脉冲的能量沉积。当入射伽马射线进入探测器时,由于相互作用,在探测器体积内产生短脉冲。我们获得了各种伽马源的脉冲高度谱,可用于计算研究所需要的不同闪烁体的性质。同时,在模拟中,研究了源到探测器表面的距离以研究探测距离对闪烁体探测器的闪烁特性的影响。当使用137Cs(662keV)源时,LaBr3(Ce)闪烁体探测晶体的能量分辨率为3.455%,FWHM为22.81keV。随着入射γ射线能量的增加,闪烁体探测器的FWHM随之增大,而LaBr3(Ce)闪烁体探测器的能量分辨率和绝对探测效率降低。同时我们也从实验上研究...
【文章页数】:55 页
【学位级别】:硕士
【文章目录】:
摘要
Abstract
Chapter 1. Introduction
1.1 Literature Review
1.2 General Properties of Scintillation Detectors
1.2.1 Full Width at Half Maximum
1.2.2 Energy resolution
1.2.3 Absolute Detection efficiency
1.3 Photon Interaction Theory
1.3.1 Photoelectric effect
1.3.2 Compton Scattering
1.3.3 Pair Production
1.4 Research Objective
1.5 Research Methodology
1.6 Thesis Outline
Chapter 2. Introduction to MCNP Code
2.1 Introduction
2.2 Input File of MCNP Code
2.2.1 Cell Card Section
2.2.2 Surface Card Section
2.2.3 Data Card Section
2.3 Summary
Chapter 3. Experimental setup and Simulation Model
3.1 Experimental setup
3.2 Crystal Package
3.2.1 Basic Packaged Scintillator
3.2.2 Integrally Mounted Scintillator/Light-sensing Device Assembly
3.3 Photomultiplier Tube
3.4 Energy Linearity of PM Tube
3.5 Gamma Energy Peak
3.6 Energy Calibration
3.7 Multichannel analyzer
3.7.1 PHA Mode
3.7.2 MCS Mode
3.8 MCNP Simulation
3.9 Summary
Chapter 4. Results and Discussion
4.1 Pulse Height spectrum
4.2 Energy Calibration
4.3 Calculation of GEB Parameters
4.4 Scintillation Properties of Scintillation Detector
4.4.1 Full width at half maximum
4.4.2 Energy resolution
4.4.3 Full energy peak absolute detection efficiency
4.5 Summary
Chapter 5. Conclusion
References
Publications During Postgraduate Study
Acknowledgements
About the Author
本文编号:4031004
【文章页数】:55 页
【学位级别】:硕士
【文章目录】:
摘要
Abstract
Chapter 1. Introduction
1.1 Literature Review
1.2 General Properties of Scintillation Detectors
1.2.1 Full Width at Half Maximum
1.2.2 Energy resolution
1.2.3 Absolute Detection efficiency
1.3 Photon Interaction Theory
1.3.1 Photoelectric effect
1.3.2 Compton Scattering
1.3.3 Pair Production
1.4 Research Objective
1.5 Research Methodology
1.6 Thesis Outline
Chapter 2. Introduction to MCNP Code
2.1 Introduction
2.2 Input File of MCNP Code
2.2.1 Cell Card Section
2.2.2 Surface Card Section
2.2.3 Data Card Section
2.3 Summary
Chapter 3. Experimental setup and Simulation Model
3.1 Experimental setup
3.2 Crystal Package
3.2.1 Basic Packaged Scintillator
3.2.2 Integrally Mounted Scintillator/Light-sensing Device Assembly
3.3 Photomultiplier Tube
3.4 Energy Linearity of PM Tube
3.5 Gamma Energy Peak
3.6 Energy Calibration
3.7 Multichannel analyzer
3.7.1 PHA Mode
3.7.2 MCS Mode
3.8 MCNP Simulation
3.9 Summary
Chapter 4. Results and Discussion
4.1 Pulse Height spectrum
4.2 Energy Calibration
4.3 Calculation of GEB Parameters
4.4 Scintillation Properties of Scintillation Detector
4.4.1 Full width at half maximum
4.4.2 Energy resolution
4.4.3 Full energy peak absolute detection efficiency
4.5 Summary
Chapter 5. Conclusion
References
Publications During Postgraduate Study
Acknowledgements
About the Author
本文编号:4031004
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