利用波长色散 X 射线荧光光谱测定宇宙地质学样品中的稀土元素

IF 2.9 3区 化学 Q2 CHEMISTRY, MULTIDISCIPLINARY
Ella De Pauw*, Pieter Tack, Miles Lindner, Thibaut Baert, Jan Garrevoet, Dennis Brückner, Axel Gerdes, Gerald Falkenberg, Frank E. Brenker and Laszlo Vincze, 
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引用次数: 0

摘要

虽然稀土元素通常用LA-ICP-MS等破坏性技术探测,但这至少会导致样品的部分破坏,这在检查珍贵材料(如宇宙地质(返回)样品)时是不可取的。利用所提出的波长色散同步辐射x射线荧光光谱技术,可以无损地对珍贵样品中位于4.65 ~ 7.66 keV之间的稀土元素特征l线进行定性和定量检测。该方法基于顺序扫描θ-2θ几何设置,利用扁平Ge(111)分析仪晶体和小型能量色散探测器,测量布拉格条件下的辐射。在样品和晶体之间放置多毛管半聚焦透镜,对辐射进行准直和引导,以优化探测立体角。通过将获得的定量结果与先前在样品上测量的LA-ICP-MS结果进行比较,可以验证该技术。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Determination of Rare Earth Elements in Cosmo-geological Samples Aided by Wavelength Dispersive X-ray Fluorescence Spectroscopy

Determination of Rare Earth Elements in Cosmo-geological Samples Aided by Wavelength Dispersive X-ray Fluorescence Spectroscopy

While rare earth elements are generally probed with destructive techniques such as LA-ICP-MS, this causes at least partial destruction of the sample, which is not desirable when precious materials such as cosmo-geological (return) samples are examined. With the proposed wavelength dispersive synchrotron radiation X-ray fluorescence spectroscopy technique the rare earth element characteristic L-lines, situated between 4.65 and 7.66 keV, can be qualitatively and quantitatively detected in a nondestructive manner in precious samples. The method is based on a sequential scanning θ-2θ geometrical setup making use of a flat Ge(111) analyzer crystal and a small energy dispersive detector, measuring the radiation in Bragg conditions. To optimize the solid angle of detection a polycapillary half-focusing lens was positioned between the sample and the crystal, collimating and guiding the radiation. Validation of the technique is provided by comparing the obtained quantitative results with previously obtained LA-ICP-MS results measured on the sample.

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来源期刊
ACS Earth and Space Chemistry
ACS Earth and Space Chemistry Earth and Planetary Sciences-Geochemistry and Petrology
CiteScore
5.30
自引率
11.80%
发文量
249
期刊介绍: The scope of ACS Earth and Space Chemistry includes the application of analytical, experimental and theoretical chemistry to investigate research questions relevant to the Earth and Space. The journal encompasses the highly interdisciplinary nature of research in this area, while emphasizing chemistry and chemical research tools as the unifying theme. The journal publishes broadly in the domains of high- and low-temperature geochemistry, atmospheric chemistry, marine chemistry, planetary chemistry, astrochemistry, and analytical geochemistry. ACS Earth and Space Chemistry publishes Articles, Letters, Reviews, and Features to provide flexible formats to readily communicate all aspects of research in these fields.
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