高能X射线源焦斑尺寸的时间分辨诊断
Time-resolved spot size diagnosis for high-energy X-ray source
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摘要: 将门控分幅相机与快闪烁晶体结合，构成时间分辨X射线诊断系统，对神龙一号直线感应加速器产生的高能脉冲X射线源焦斑进行了测量，在时间间隔为10 ns的情况下，获得了焦斑尺寸随时间的变化曲线。在此基础上，设计了单像素尺寸为0.78 mm×0.78 mm的LYSO闪烁晶体阵列，并进行了X射线照射晶体阵列发光的初步实验，结果表明该阵列可用于高能X射线源焦斑的时间分辨诊断,并能显著提高成像的空间分辨力。Abstract: A time-resolved measurement system of spot size for X-ray sources was constructed by coupling a gated CCD camera with a fast scintillator crystal. The spot size of the high-energy pulsed X-ray source from the Dragon-Ⅰ linear induction accelerator was measured at 10 ns intervals, and a curve of spot size versus time was obtained. An LYSO crystal array with a pixel size of 0.78 mm was also designed and tested in X-ray field, and primary experimental results show the array can be used for time-resolved spot size diagnosis of the high energy X-ray source and significantly improve the spatial resolution of X-ray images.
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Key words:
- x-ray spot size /
- temporal resolution /
- lyso crystal /
- linear induction accelerator
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