Results 281 to 290 of about 112,596 (333)
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X-ray fluorescence spectrometry with synchrotron radiation
Analytica Chimica Acta, 1985Abstract X-ray fluorescence spectrometry (x.r.f.) can be done through excitation with synchrotron radiation. This permits multi-element determinations in the trace region with improved detection limits compared to conventional x.r.f. Detection limits are evaluated and compared with theoretically calculated values.
W. Petersen, Arndt Knöchel, G. Tolkiehn
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X-ray Fluorescence Spectrometry of Asteroid Itokawa by Hayabusa
Science, 2006X-ray fluorescence spectrometry of asteroid 25143 Itokawa was performed by the x-ray spectrometer onboard Hayabusa during the first touchdown on 19 November 2005. We selected those data observed during relatively enhanced solar activity and determined average elemental mass ratios of Mg/Si = 0.78 ± 0.09 and Al/Si = 0.07 ± 0.03.
Takehiko Arai +11 more
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The analysis of silver by x-ray fluorescence spectrometry
Analytica Chimica Acta, 1978Abstract An x-ray fluorescence method is described for the analysis of silver alloys.The major element silver as well as the impurities are determined. Corrections are made for interelement and line overlap effects. The results obtained compare favourably with wet chemical and emission spectrometric values. The method is rapid and reliable.
F.T. Wybenga, L.R.P. Butler
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Analysis of tungsten carbides by X-ray fluorescence spectrometry
Talanta, 1976Five sample presentation techniques were examined for the X-ray fluorescence spectrometric analysis of tungsten carbide alloys in powder and cemented forms. Powder samples may be oxidized by air at 600 degrees before fusion (I), or preferably by lithium nitrate during fusion (II); the fusion is effected with lithium-lanthanum tetraborate followed by ...
C.B. Belcher, A.C. Knott, K. Kinson
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Hand-held X-ray fluorescence spectrometry
Analytical Methods, 2019This Technical Brief describes the evolution of hand-held X-ray fluorescence instrumentation designed for inorganic elemental analysis outside the confines of a laboratory, thereby offering the capability for in situ analysis. As well as providing an overview of the instrumentation, it aims to inform both analysts and less-technically aware users how ...
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X-Ray Fluorescence Spectrometry
2010The article contains sections titled: 1. Introduction 2. Properties of X Rays 3. Interaction of X Rays with Matter 3.1. Photoelectric Effect 3.2. Scattered Radiation 4. Attenuation of X Rays in Matter 5. Penetration of X Rays 6. Instrumentation 6.1. X-Ray Sources 6.2. X-Ray Detectors 6.3. Geometrical Considerations 6.4.
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X-ray fluorescence spectrometry in the mining industry
1991A change from conventional wet chemical analysis to the non-destructive x-ray fluorescence spectrometry method in the nickel mining and processing industry is described, highlighting speed, cost and scope advantages. Problems encountered with respect to reference standards acquisition, calibration and manpower training are also highlighted.
E. Chikukwa, L. Akino
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Portable X‐ray fluorescence spectrometry analysis of soils
Soil Science Society of America Journal, 2020AbstractPortable X‐ray fluorescence (PXRF) spectrometry is a proximal sensing technique whereby low‐power X‐rays are used to make elemental determinations in soils. The technique is rapid, portable, and provides multi‐elemental analysis with results generally comparable to traditional laboratory‐based techniques.
David C. Weindorf, Somsubhra Chakraborty
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Quantification in grazing-emission X-ray fluorescence spectrometry
Spectrochimica Acta Part B: Atomic Spectroscopy, 1999Abstract In grazing-emission X-ray fluorescence (GEXRF) spectrometry wavelength-dispersive detection can be applied. Much softer radiation and hence lighter elements than in total-reflection X-ray (TXRF) spectrometry can thus be detected. We used simulations to investigate methods of quantification of GEXRF results involving soft characteristic ...
Spolnik, Zoya +4 more
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The Determination of Thorium in Monazite by Fluorescent X-Ray Spectrometry
Advances in X-ray Analysis, 1963AbstractA method is presented for the quantitative determination of thorium in monazite by fluorescent X-ray speetrometry. Strontium is used as an internal standard, and sample preparation consists of mechanically blending the finelyground (325-mesh) sample with reagent grade strontium carbonate.
M. M. English, M. C. Farquhar
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