在核物理中,伽馬探測(cè)技術(shù)被廣泛應(yīng)用于伽馬光譜學(xué)中。閃爍體探測(cè)器廣泛應(yīng)用于醫(yī)療、工業(yè)、能源和環(huán)境等領(lǐng)域,其中Nal(T1)閃爍體探測(cè)器在過去的50年中得到了廣泛的應(yīng)用。最近,新的鑭系閃爍體特別是LaBr3(Ce)閃爍體因其高的發(fā)光效率及快的響應(yīng)時(shí)間成為新型輻射探測(cè)材料的研究熱點(diǎn)。本論文主要采用理論模擬及實(shí)驗(yàn)研究的方法,建立LaBr3(Ce)閃爍體探測(cè)器,計(jì)算半高寬(FWHM)、能量分辨率、γ能譜的全能峰效率等性能參數(shù)�；诿商乜_(MCNP)中探測(cè)器模型,采用F8來記錄探測(cè)器中產(chǎn)生的脈沖的能量沉積。當(dāng)入射伽馬射線進(jìn)入探測(cè)器時(shí),由于相互作用,在探測(cè)器體積內(nèi)產(chǎn)生短脈沖。我們獲得了各種伽馬源的脈沖高度譜,可用于計(jì)算研究所需要的不同閃爍體的性質(zhì)。同時(shí),在模擬中,研究了源到探測(cè)器表面的距離以研究探測(cè)距離對(duì)閃爍體探測(cè)器的閃爍特性的影響。當(dāng)使用137Cs(662keV)源時(shí),LaBr3(Ce)閃爍體探測(cè)晶體的能量分辨率為3.455%,FWHM為22.81keV。隨著入射γ射線能量的增加,閃爍體探測(cè)器的FWHM隨之增大,而LaBr3(Ce)閃爍體探測(cè)器的能量分辨率和絕對(duì)探測(cè)效率降低。同時(shí)我們也從實(shí)驗(yàn)上研究...

【文章頁數(shù)】：55 頁

【學(xué)位級(jí)別】：碩士

【文章目錄】：
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



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