球面晶体分析器在X射线成像诊断中的研究  

X-ray imaging diagnosis using spherically bent crystal analyzer

作　　者：钱家渝[1] 肖沙里[1] 毋玉芬[1] 刘利锋[1] 

机构地区：[1]重庆大学光电技术及系统教育部重点实验室,重庆400030

出　　处：《应用光学》2011年第2期241-244,共4页Journal of Applied Optics

基　　金：国家自然科学基金&中国工程物理研究院联合基金资助项目(10976033)

摘　　要：为诊断激光等离子体X射线,研制了基于Bragg衍射原理的球面弯曲晶体。球面晶体可提高空间分辨、光谱分辨及立体角收集辐射能力。实验采用球面弯曲石英晶体作为分析器,X射线成像板作为成像器件,利用X射线衍射仪铬靶Kα单色谱成像,验证了0.2 mm间隔双丝的单能像,球面弯晶具有较高的光谱分辨力和信噪比,谱分辨力可达1 000,聚光效率在同样距离条件下比平晶分析器高一个数量级以上。A spherical bent crystal was developed based on Bragg diffraction to diagnose laser plasma X-ray.Spatial resolution,spectral resolution and radiation collected by solid angle were increased by using the spherically bent crystal.The spherically bent quartz crystal and X-ray imaging plate were adopted as X-ray analyzer and imaging device respectively.The imaging experiment was carried out with an X-ray diffractometer using Cr-target.The experimental results show that the monochromatic image of two-wire with a space of 0.2mm is obtained,the spectrograph of the spherically bent crystal offers good spectral resolution and signal-to-noise,and the calculated wavelength resolution reaches 1000 in 0.2 nm^0.4 nm.The spherically bent crystal is suitable for diagnosing soft X-ray spectroscopy,and the focusing intensity for spherically bent crystal is an order of magnitude higher than plane crystal at the same condition.

关 键 词：球面晶体分析器 光谱测量 晶体谱仪 X射线诊断 

分 类 号：TN249[电子电信—物理电子学]