| X射线在影像增强器中散射特性的研究 |
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| 引用本文： | 郭小川,牛憨笨. X射线在影像增强器中散射特性的研究[J]. 计算物理, 2000, 17(3): 298-306 |
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| 作者姓名： | 郭小川 牛憨笨 |
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| 作者单位： | 中国科学院西安光学精密机械研究所，陕西西安 710068 |
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| 基金项目： | Supported by the NationalNatural Foundation of China |
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| 摘 要： | Ｘ射线在影像增强器中的散射是影响Ｘ射线影像增强器输出图像对比度和分辨率的主要因素。首先用Ｍｏｎｔｅ Ｃｓｒｏｌｏ方法模拟了轫致辐射Ｘ射线与影像增强器的输入转换屏（ＣｓＩ：Ｎａ）的作用过程，给陋了透过转换屏的Ｘ射线的能谱。然后以无限大平面铁板作为增强器内电极和客壳的几何模型，以ＣｓＩ：Ｎａ的透过Ｘ射线能谱为铁板模型的入射能 ，分析了Ｘ射线在影像增强器中的背向散射特性。Ｘ射线管电压为２０～１２０ｋＣＶ
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| 关 键 词： | 影像增强器 轫致辐射 背向散射 X射线 |
| 文章编号： | 1001-246X(2000)03-0298-09 |
| 修稿时间： | 1998-09-26 |
STUDY OF SCATTERING PROPERTIES OF X RAYS IN INTENSIFIERS |
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| GUO Jin-chuan,NIU Han-ben. STUDY OF SCATTERING PROPERTIES OF X RAYS IN INTENSIFIERS[J]. Chinese Journal of Computational Physics, 2000, 17(3): 298-306 |
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| Authors: | GUO Jin-chuan NIU Han-ben |
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| Abstract: | The interaction processes of bremsstrahlung X rays with CsI: Na scintillator of different thickness(200～400μm) are first siulated by means of Monte Carlo analysis. The energy spectra of exit photons from CsI: Na are presented,which are used as the incident spectra on iron, the constituents of the inner electrodes and shell of intensifiers. The backscattering properties of X rays in intensifiers are analyzed. The potential producing bremsstrahlung X rays is 20～120kV. Results show that with the increase of X ray tube potential the number of backscattered photons gets bigger and their mean energies increase rapidly. |
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| Keywords: | bremsstrahlung backscattered radiation Monte Carlo method |
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