X光导管传输特性的蒙特卡罗模拟
Simulation of X-ray transmission through mono-capillaries by Monte-Carlo method
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摘要: X光在导管中的传输性能是设计X光透镜的基础。在研究X光导管传输理论基础上，建立了X光在导管中传输的射线跟踪方法，编制了蒙特卡罗模拟计算程序。对具体的模型，计算给出了导管的传输效率随X光源与导管入口面的距离、导管直径和曲率半径的变化关系。模拟表明：直圆柱导管的传输效率随导管直径增大而减小，随Ｘ光源所在平面与导管入口面之间的距离增大而增大；弯曲圆柱导管的传输效率随其曲率半径的增大而增大，当曲率半径趋向无穷大时，X光在弯圆柱导管的传输效率趋向于直圆柱导管的传输效率。利用编制程序计算得到的传输效率与实验结果符合较好。Abstract: The X-ray transmission property of mono-capillaries is the basis for designing X-ray lens. Based on the theory of X-ray transmission through capillaries, a detailed Monte-Carlo method is suggested in this paper. A corresponding computer program is worked out. For a given model, the transmission efficiencies of mono-capillaries versus diameter, incident focus and curvature radius are calculated. The transmission efficiencies of straight capillary reduce as capillary diameter increases. The transmission efficiencies of curved capillary increase as capillary curvature increase. The simulative results agree well with the corresponding experimental results．
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Key words:
- x-ray /
- capillary /
- transmission efficiency /
- monte-carlo method
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