X、γ射线增感屏性能的Monte Carlo模拟研究

发布时间：2018-03-26 13:46

本文选题：增感屏　切入点：光子与电子耦合输运效率　出处：《黑龙江大学》2015年硕士论文

【摘要】：在工业探伤检测中,选择合适的金属增感屏可以缩短曝光时间、提高增感效率,降低对从业人员的辐射剂量。本文主要采用蒙特卡罗方法模拟了4Me V加速器、200KeVX光机、192Ir源和60Coγ光子源的光子与电子耦合输运过程,选择了原子序数低和高的两种金属屏,分别为铜、铅。模拟分别得到了两种金属屏的电子平均能量、光子与电子耦合输运效率与金属屏厚度的关系,并与实验结果对比,得到了在不同探伤仪的情况下,铜和铅金属增感屏的最佳厚度和铅金属屏的增感系数,为探伤检测中选择合适的金属屏提供了依据。在医用X射线成像中,选择合适的荧光增感屏能够提高胶片的清晰度、减少动态模糊,本文研究了可见光在荧光增感屏中的输运过程,运用蒙特卡罗(MC)方法计算了出射可见光的收集效率与增感屏厚度的关系。
[Abstract]:In the industrial flaw detection, selecting the appropriate metal sensitizing screen can shorten the exposure time and improve the sensitization efficiency. In this paper, Monte Carlo method is used to simulate the photon electron coupling transport process of the 4Me V accelerator 200KeV X-ray machine and the 60Co 纬 photon source. Two kinds of metal screens with low atomic number and high atomic number are selected. The electron average energy, photon and electron coupling transport efficiency and the thickness of the metal screen are obtained by simulation. The results are compared with the experimental results, and the results of different flaw detectors are obtained. The optimum thickness of copper and lead metal sensitizer screen and the enhancement coefficient of lead metal screen provide the basis for selecting the appropriate metal screen in flaw detection. In medical X-ray imaging, choosing the appropriate fluorescent sensitizing screen can improve the clarity of film. In order to reduce the dynamic ambiguity, the transport process of visible light in the fluorescent sensitizing screen is studied. The relationship between the collection efficiency of visible light and the thickness of the screen is calculated by Monte Carlo method.
【学位授予单位】：黑龙江大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TG115.28

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