High energy X-ray spot size measurement with rollbar
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摘要: 应用于高能闪光X光照相技术的X射线源焦斑大小是闪光照相装置的关键参数, 直接影响成像的分辨能力。由于高能X射线的强穿透性和强辐射环境, 给焦斑测量带来一定困难。介绍了一种间接测量方法, 采用滚边装置(rollbar)成像得到X射线源的边扩展函数, 微分后得到光源的线扩展函数并计算调制传递函数(MTF), 而后从MTF为0.5所对应的空间频率之值确定出光源的光斑大小。给出了神龙二号加速器电子束聚焦调试实验中得到的X射线焦斑测量结果, 分析影响测量结果的因素并提出了解决方法。Abstract: The X-ray spot size is a critical parameter for flash radiography facility which degrades resolution in the flash radiography. It is difficult to measure the X-ray spot size in the condition of intense radiation and its penetrability. This paper describes a rollbar used to measure the X-ray focal spot size. The edge spread function(ESF), line spread function(LSF) and modulation transfer function(MTF) of the X-ray spot are obtained from the rollbar image data, and the X-ray spot size is determined by the MTF. In the experiment of Dragon-Ⅱ linear induction accelerator downstream and target, the X-ray spot size is measured and the results are analyzed.
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Key words:
- high energy X-ray /
- spot size /
- modulation transfer function /
- rollbar
期刊类型引用(3)
1. 李勤，王毅，刘云龙，祁双喜，程晋明，龙全红，李天涛. 针孔法测量X光源焦斑尺寸. 强激光与粒子束. 2021(04): 99-106 . 
本站查看2. 李延鹏，敖海麒，周建斌，杨强. 关于X射线管焦点测量的初步探讨. 宁夏师范学院学报. 2019(04): 23-29 . 百度学术3. 严维鹏，李斌康，宋顾周，马继明，段宝军，韩长材，宋岩，姚志明. 闪烁体衰减常数对辐射源边界测量影响数值模拟. 强激光与粒子束. 2017(06): 139-144 . 本站查看其他类型引用(0)
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