共查询到19条相似文献,搜索用时 796 毫秒
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同步辐射X射线荧光分析 总被引:2,自引:0,他引:2
同步辐射作为一种新型光源的出现,给X射线应用领域的各学科注入了新的活力,世界上许多国家纷纷建造同步辐射加速器并投入使用,使同步辐射的应用得到空前的发展,同步辐射X射线荧光分析就是其中的一个重要方面.文章讨论了常规X射线荧光分析的局限性,概略地描述了同步辐射在荧光分析方面的优越性,指出它为X射线荧光分析技术带来的新突破 痕量元素的检测和微区扫描分析,简要介绍了国际及国内同步辐射X射线荧光分析的水平及现状,并展望了以后的发展方向. 相似文献
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通过对GaAs(100)抛光晶片在相同条件下掠出射X射线荧光实验的可重复性研究,并结合常规光源与同步辐射光源X射线掠出射荧光实验结果的对比,证明自行研制的掠出射X射线荧光平台可重复性较好,稳定性较高,实验方法的设计是合理的。理论计算与实验曲线符合的较好,证明掠出射X射线荧光实验中用单晶的全反射临界角标定掠出射角度的方法是可行的。用标准晶片掠出射X射线荧光曲线的微分评测了实际角发散度的大小。 相似文献
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同轴X射线相位衬度计算机X射线断层摄影术研究 总被引:2,自引:2,他引:0
基于北京同步辐射装置(BSRF)开展了同轴X射线相位衬度计算机X射线断层摄影术(CT)研究.利用北京同步辐射的14 keV单色X射线作为光源,以高分辨能力的X射线胶片作为探测器,分别开展吸收衬度和同轴相位衬度成像的比较研究以及相位衬度计算机X射线断层摄影术研究.相位衬度计算机X射线断层摄影术重建采用Bronnikov提出的算法.结果显示,与传统的吸收衬度图像相比,相位衬度图像具有更好的衬度和更高的空间分辨力;实验获得人工样品和蝗虫的相位衬度计算机X射线断层摄影术重建图像.重建图像中可见样品的一些结构细节.实验结果表明,相位衬度X射线成像更适合于研究弱吸收或吸收差异很小的材料;利用北京同步辐射开展同轴X射线相位衬度计算机X射线断层摄影术研究是可行的. 相似文献
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在上海光源硬X射线微聚焦光束线站(BL15U1)上, 基于EPICS软件平台, 集成运动控制, 光强探测, 荧光探测等功能, 实现了"飞行"模式 (on-the-fly) X射线扫描微束荧光成像方法. 用"飞行"扫描X射线荧光成像法获得了标准镍网, 以及微量元素Cu, Zn,K, Fe在样品老鼠脾内的分布图像, 结果显示该方法不但在速度上有了极大的提高, 而且获得的元素分布图像具有高质量.
关键词:
快速扫描X射线微束荧光成像
同步辐射
微量元素分布 相似文献
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同步辐射X射线相衬显微CT在古生物学中的应用 总被引:3,自引:0,他引:3
X射线无损成像技术在古生物化石标本研究领域中应用十分广泛.近几年来,随着技术的不断革新,同步辐射X射线相衬显微断层成像技术(SRX-PC-μCT)也被引入到这一领域.由于同步辐射光源产生的硬X射线具有高亮度、高准直性和高空间相干性等优点,可以实现化石标本高分辨率(亚微米级)的无损三维显微成像,给古生物学的发展带来了新的机遇.文章简要回顾了用于古生物化石标本无损成像技术的发展历程,并在此基础L综述了同步辐射X射线断层显微成像技术在古生物学领域的应用现状和前景. 相似文献
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Hiroshi Sawa 《Synchrotron Radiation News》2013,26(3):7-8
The 18th Annual Meeting and General Assembly of the Japanese Society for Synchrotron Radiation Research (JSSRR) and the joint symposium of synchrotron radiation facility user's society groups were held at Sun-Messe Tosu Conference Hall in Tosu City, Japan, from January 7 to 9, 2005. The meeting was attended by 607 people and included 6 symposiums, 96 oral presentations, and 356 poster presentations covering all aspects of synchrotron radiation research and technology. The meeting also included 49 industrial exhibitions. The six symposiums were on “Recent progress on soft X-ray optical elements,” “Now and the future on SR-XRF analysis for biological and environmental sciences,” “Recent development of THz Coherent Synchrotron Radiation,” “Super high-resolution protein structure analysis,” “Frontlines of Bio-Nano-microspectroscopy by UV-SX high brilliance SR,” and “The role of synchrotron radiation in the future of science: groundbreaking SR utilization for research on excited states”. 相似文献
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本文分析了同步辐射小角X射线散射的特点与应用、国内外现状及新建北京同步辐射小角X射线散射站的必要性与机遇。 相似文献
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利用荧光CT实现生物医学样品内元素分布的无损成像 总被引:1,自引:0,他引:1
荧光CT是一种可无损重建元素空间分布的发射型断层成像技术,对生物医学研究具有重要意义.同步辐射的高通量、高准直和能量可调等特性使荧光CT的生物医学应用成为可能.文章通过优化设计,在上海同步辐射光源建立了一套用于生物医学样品微量元素分析的荧光CT成像系统.通过对实验装置的优化,提高了系统的数据采集速度和空间分辨率.将极大... 相似文献
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大气颗粒物重金属元素分析技术研究进展 总被引:3,自引:0,他引:3
大气颗粒物已经成为当前大气环境首要污染物,而其中重金属由于具有非降解性和滞后性,严重威胁人类生命和自然环境,已成为当前研究热点。对分析大气颗粒物中重金属元素所用原子吸收光谱法、电感耦合等离子体原子发射光谱法、电感耦合等离子体质谱法、荧光光谱法、中子活化法、辉光放电原子发射光谱法、微波等离子体原子发射光谱法和激光诱导击穿光谱法进行了综述,并尝试对这些技术的不足之处提出一些改进建议:连续光源原子吸收光谱法同时测定多种元素,原子发射光谱法直接测定颗粒物,高分辨率激光剥蚀电感耦合等离子质谱法测定固体样品,低散射同步加速荧光法测定大气颗粒物和k0中子活化法测定对流层发射性元素。大气颗粒物重金属元素的时空分布差异和人类对环境空气质量要求的提高以及现代仪器科学技术的高速发展促使大气颗粒物重金属元素分析技术朝着实时、快速、检出限低、直接测定和操作简便的方向发展。 相似文献
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Synchrotron radiation activities in China date back to the late 1970s. With the large increase of investment in science by the Chinese central government to promote the development of science and technology in China, quite a few large scientific projects were proposed by the scientific community, among which were Beijing Electron-Positron Collider (BEPC) and Hefei Synchrotron Radiation Light Source (HLS). The major aim of BEPC was for the studies of high energy particle physics with a parasitic synchrotron radiation facility, i.e., the so-called Beijing Synchrotron Radiation Facility (BSRF). It started operation in 1991 and became the first synchrotron radiation facility in China. As a parasitic facility, BSRF operated a few months a year and played an important role in fostering the synchrotron radiation user community in China. The HLS, a dedicated synchrotron radiation facility, came into operation almost at the same time as BSRF. As a lower energy synchrotron radiation facility, it aimed mostly at the applications of synchrotron radiation VUV wavelength range. Both BSRF and HLS were upgraded again due to strong demands from users. The rapid development of synchrotron radiation applications and facilities in the world in the 1980s and early 1990s spurred the great interest of Chinese scientists to build an advanced synchrotron radiation light source. A third generation light source was first proposed in mainland China in 1993 and was later shaped as the Shanghai Synchrotron Radiation Facility (SSRF) in 1995. 相似文献
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Tina Tseng 《Synchrotron Radiation News》2016,29(1):21-22
HERCULES (Higher European Research Course for Users of Large Experimental System) School, co-organized by Université Joseph Fourier and Grenoble INP, has provided training for students, postdocs, and scientists from European and non-European universities and laboratories in the fields of synchrotron radiation and neutron science for condensed matter studies (biology, chemistry, physics, materials science, geosciences, industrial applications) since 1991. Throughout the years spent cultivating next-generation scientists, HERCULES School has been recognized as an internationally known training course. Given the success of the course in Europe, the Hercules Specialized Course (HSC) decided to cooperate with an overseas synchrotron radiation facility every five years to help nourish more young scientists outside Europe. The first overseas Hercules School, known as the Latin-American Edition of Hercules in Brazil, was co-organized by HSC and the Brazilian Synchrotron Light Laboratory in 2010. After this first successful overseas course in Latin America, Wen-Guey Wu, the past director of the Science and Technology Division of the National Science Council of Taiwan in France, recommended the National Synchrotron Radiation Research Center (NSRRC) in Taiwan to the founder and the previous chairman of HSC, Jean-René Regnard, for co-organizing the second overseas Hercules School. An Asia-Pacific Edition of HERCULES in Taiwan was then in place for 2015. 相似文献
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Loïc Bertrand Marine Cotte Marco Stampanoni Mathieu Thoury Federica Marone Sebastian Schöder 《Physics Reports》2012
Synchrotron photon-based methods are increasingly being used for the physico-chemical study of ancient and historical materials (archaeology, palaeontology, conservation sciences, palaeo-environments). In particular, parameters such as the high photon flux, the small source size and the low divergence attained at the synchrotron make it a very efficient source for a range of advanced spectroscopy and imaging techniques, adapted to the heterogeneity and great complexity of the materials under study. The continuous tunability of the source — its very extended energy distribution over wide energy domains (meV to keV) with a high intensity — is an essential parameter for techniques based on a very fine tuning of the probing energy to reach high chemical sensitivity such as XANES, EXAFS, STXM, UV/VIS spectrometry, etc. The small source size attained (a few micrometres) at least in the vertical plane leads to spatial coherence of the photon beams, giving rise in turn to a series of imaging methods already crucial to the field. This review of the existing literature shows that microfocused hard X-ray spectroscopy (absorption, fluorescence, diffraction), full-field X-ray tomography and infrared spectroscopy are the leading synchrotron techniques in the field, and presents illustrative examples of the study of ancient and historical materials for the various methods. Fast developing analytical modalities in scanning spectroscopy (STXM, macro-XRF scanning) and novel analytical strategies regarding optics, detectors and other instrumental developments are expected to provide major contributions in the years to come. Other energy domains are increasingly being used or considered such as far-infrared and ultraviolet/visible for spectroscopy and imaging. We discuss the main instrumental developments and perspectives, and their impact for the science being made on ancient materials using synchrotron techniques. 相似文献