Evaluation of Different Synchrotron Beamline Configurations for X-ray Fluorescence Analysis of Environmental Samples

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• 作者：Sean R. Barberie ; Christopher R. Iceman ; Catherine F. Cahill ; Thomas M. Cahill
• 刊名：Analytical Chemistry
• 出版年：2014
• 出版时间：August 19, 2014
• 年：2014
• 卷：86
• 期：16
• 页码：8253-8260
• 全文大小：331K
• ISSN：1520-6882

文摘

Synchrotron radiation X-ray fluorescence (SR-XRF) is a powerful elemental analysis tool, yet synchrotrons are large, multiuser facilities that are generally not amenable to modification. However, the X-ray beamlines from synchrotrons can be modified by simply including X-ray filters or removing monochromators to improve the SR-XRF analysis. In this study, we evaluated four easily applied beamline configurations for the analysis of three representative environmental samples, namely a thin aerosol sample, an intermediate thickness biological sample, and a thick rare earth mineral specimen. The results showed that the 鈥渨hite beam鈥?configuration, which was simply the full, polychromatic output of the synchrotron, was the optimal configuration for the analysis of thin samples with little mass. The 鈥渇iltered white beam鈥?configuration removed the lower energy X-rays from the excitation beam so it gave better sensitivity for elements emitting more energetic X-rays. The 鈥渇iltered white beam鈥揻iltered detector鈥?configuration sacrifices the lower energy part of the spectrum (<15 keV) for improved sensitivity in the higher end (26 to 48 keV range). The use of a monochromatic beam, which tends to be the standard mode of operation for most SR-XRF analyses reported in the literature, gave the least sensitive analysis.