共查询到17条相似文献,搜索用时 62 毫秒
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软X射线计量标准的建立和软X射线探测器标定是目前国内急需解决的课题,本简单介绍了两套北京同步辐射软X射线装置,它们主要用于软X射线光学元件测量和软X射线探测元、器件的标定。另外给出了近年来在软X射线测量装置上开展的计量标准和探测器标定方面的研究结果。 相似文献
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简单介绍了2套北京同步辐射软X射线装置,主要用于软X射线光学元件测量和软X射线探测元、器件的标定。给出了在软X射线测量装置上计量标准和探测器标定方面的研究结果。 相似文献
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软X射线晶体标定系统研制 总被引:2,自引:0,他引:2
研制了一套完整的软X射线晶体积分反射系数标定系统,包括针对CC224M软X射线源所设计的专用的晶体标定室、晶体与探测器的转动控制机构、复合真空及供气系统、作为标定探测器的流气式正比计数器等。在这一系统上开展了实验研究,获得了TAP晶体对Cu-Lα(13.33)、Al-Kα(8.32)两种入射波长的积分反射系数,验证了系统的有效性。 相似文献
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北京同步辐射软X射线装置与软X射线探测器标定 总被引:3,自引:0,他引:3
简单介绍了2套北京同步辐射软X射线装置,主要用于软X射线光学元件测量和软X射线探测元,器件的标定,给出了软件X射线装置上计量标准和探测器标定方面的研究结果。 相似文献
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X射线荧光分析是一种重要的仪器分析方法,在元素分析方面有着非常广泛的应用。但在后处理工艺分析中,X射线荧光分析应用较少,主要原因是样品本身的放射性对测量产生较大干扰。本实验室根据文献报道以及X射线衍射基本原理,白行设计组装完成了一套石墨晶体预衍射EDXRF分析装置。在实际的测量中,由于基体组成复杂,因此,本工作研究了在1AW中的主要基体元素对U测定的影响。 相似文献
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在Pu纯化过程研究中,需严格控制Pu的回收率,尾液中Pu的浓度控制在几μg/mL水平。为测定尾液中的Pu浓度,研究建立了一套封闭式石墨晶体预衍射XRF装置。 相似文献
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光束位置探测器是同步辐射装置上的"眼睛",其中荧光靶探测器是最为直观和方便使用的一种,对于光束线的调试有着重要的作用。论文对上海光源一期研制的单色光荧光靶探测器在使用过程中存在的问题,进行了较为全面的分析总结,提出了新的设计方案,改进了单色光荧光靶的结构,压缩了该装置的体积,并且采用YAG晶体做荧光靶材,提高了探测灵敏度。改造后的单色光荧光靶探测器已经成功使用在蛋白设施五线六站新的光束线站上,取得了良好的效果。 相似文献
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X射线荧光光谱仪的现状 总被引:4,自引:1,他引:4
杨明太 《核电子学与探测技术》2006,26(6):1025-1029
综述了波长色散X射线荧光光谱仪和能量色散X射线荧光光谱仪的现状和发展趋势,及其X射线荧光光谱仪的拓展,介绍了部分具有代表性的X射线荧光光谱仪的主要性能. 相似文献
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Jingke Qiu Biao DengQun Yang Fen YanAiguo Li Xiaohan Yu 《Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms》2011,269(22):2662-2666
Synchrotron-based X-ray micro-fluorescence (μ-SXRF) is a non-destructive analytical technique and has been widely used to detect and quantify the elemental composition of samples in their natural state. To determine the internal elemental distributions within samples, X-ray fluorescence microtomography has been developed based on the hard X-ray microprobe at beamline BL15U1 of the Shanghai Synchrotron Radiation Facility (SSRF) in Shanghai, China. This technique was applied to image the cross-sectional distributions of multiple elements within a single human hair, and its validity was evaluated by comparing the results with the elemental maps of a thin hair section obtained using the well-established μ-SXRF mapping method. Elemental images of S, Ca, Mn, Fe, Cu, and Zn within a virtual slice of the hair were reconstructed after the tomographic measurements. The tomographic images of heavy elements like Fe, Cu, and Zn were found to be in good agreement with the corresponding μ-SXRF maps. Light elements, such as S, however, represented different patterns due to non-negligible self-absorption in the sample, and sophisticated correction algorithms accounting for such effects are required for obtaining qualitatively and quantitatively more accurate images. Compared to μ-SXRF mapping, X-ray fluorescence microtomography reduces the sample preparation requirements and has been demonstrated in this work as being a more ideal and effective imaging modality to non-destructively mapping out the internal distribution of heavy elements within samples at the micrometer scale at the SSRF. 相似文献
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CVD金刚石膜X射线探测器的研制及性能研究 总被引:1,自引:0,他引:1
金刚石以其独特的性能成为辐射探测器的理想材料.采用HFCVD方法制备了高质量、(100)取向的CVD金刚石膜,在此基础上研制出X射线探测器.使用55Fe 5.9keV X射线研究了CVD金刚石膜探测器的光电流和电荷收集效率.结果表明,探测器在偏压加到100V还具有好的欧姆接触;电场为50kV·cm-1时的暗电流与光电流分别为16.3和16.8nA;电荷收集效率η为45.1%,对应的电荷收集距离δ(CCD)为9.0μm. 相似文献
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Petr Schauer 《Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms》2011,269(21):2572-2577
To enhance the detective quantum efficiency (DQE) of scintillation electron detectors for scanning electron microscopes or scanning transmission electron microscopes (S(T)EM), the cathodoluminescence (CL) decay kinetics of YAG:Ce single crystal scintillators is studied in this paper. Some possibilities for reductions of decay time and afterglow of the mentioned scintillators are presented. The pulse mode utilizing a blanking system and 10 keV electrons for the excitation and a sampling oscilloscope for the CL detection were used for the measurement of decay characteristics. The CL decay characteristics of YAG:Ce single crystals of different Ce concentrations, pulled by the Czochralski method and cleaned and annealed under specific conditions, were measured in dependence on excitation pulse duration and on the specimen temperature. To interpret the presented results, a kinetic model of cathodoluminescence of the YAG:Ce single crystals was created. The effects of quenching impurities and of defect centers in YAG:Ce were specified. 相似文献
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以金刚石膜/硅复合材料作为基板.运用微加工技术在金刚石膜/硅衬底上光刻铬/金微条电极.制成了流气式微条气体室探测器。在室温及101.0kPa下,使用微机多道能谱仪及辅助电子学设备在5.9keV^55FeX射线辐照下测量了微条气体室探测器在不同电压下的能谱响应和脉冲信号。结果表明微条气体室探测器具有较高的信噪比,计数率≥10^3Hz,当混合工作气体Ar:CH4=90:10、漂移电压-1000V、阴极电压-650V、阳极0V时,能量分辨率达12.3%。 相似文献