一种基于热释电效应的X射线荧光分析谱仪  

The X-Ray Fluorescence Spectrometer Based on Pyroelectric Effect

作　　者：董亦凡[1,2] 樊瑞睿[1] 郭东亚[1,2] 张春雷[1] 高旻[1] 汪锦州[1] 刘雅清[1] 周大卫[1,2] 王焕玉[1] 

机构地区：[1]中国科学院高能物理研究所,粒子天体物理重点实验室,北京100049 [2]中国科学院大学,北京100049

出　　处：《光谱学与光谱分析》2016年第2期550-554,共5页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金项目(11105161)资助

摘　　要：利用热释电晶体实现了一个X射线激发源,并以此激发源和高能量分辨率的硅漂移探测器构建了一个X射线荧光分析谱仪。首先通过分析计算热释电晶体厚度和靶厚度对产生X射线的影响选定了激发源的设计参数;然后测量了激发源发射的X射线本底,其能量范围在1~27keV,包含有Cu和Ta的特征X射线,最大强度在每秒3 000个计数以上,对本底的测量同时显示出谱仪的探测器部分对Cu的8.05keV特征峰的分辨率达到210eV,具有很高的能量分辨率;最后使用该谱仪测试了Fe,Ti和Cr等三种单质样品和高钛玄武岩样品,测试结果表明该谱仪可以有效的分析出样品的元素成分。由于这种X射线荧光分析谱仪的各组成部分体积都很小,进一步便携化后非常适合于非破坏、现场和快速的元素分析场合。Pyroelectric X-ray generator is implemented,and an X-ray fluorescence spectrometer is accomplished by combining the pyroelectric X-ray generator with a high energy resolution silicon drift detector.Firstly,the parameters of the X-ray generator are decided by analyzing and calculating the influence of the thickness of the pyroelectriccrystal and the thickness of the target on emitted X-ray.Secondly,the emitted X-ray is measured.The energy of emitted X-ray is from 1to 27 keV,containing the characteristic X-ray of Cu and Ta,and the max counting rate is more than 3 000 per second.The measurement also proves that the detector of the spectrometer has a high energy resolution which the FWMH is 210 eV at 8.05 keV.Lastly,samples of Fe,Ti,Cr and high-Ti basalt are analyzed using the spectrometer,and the results are agreed with the elements of the samples.It shows that the spectrometer consisting of a pyroelectric X-ray generator and a silicon drift detector is effective for element analysis.Additionally,because each part of the spectrometer has a small volume,it can be easily modified to a portable one which is suitable for non-destructive,on-site and quick element analysis.

关 键 词：热释电 硅漂移探测器 X射线荧光分析 

分 类 号：O657.3[理学—分析化学]