نتایج جستجو برای: xrf analysis
تعداد نتایج: 2826054 فیلتر نتایج به سال:
Geochemical analysis of the surface material of terrestrial type planets is of fundamental importance in understanding the geological context of the planetary environment. Consequently this analysis should be performed whenever possible and indeed this has occurred on a number of previous landers. Current techniques include X-ray fluorescence (XRF) and Rutherford back-scattering of alpha partic...
One of the advantages of X-ray fluorescence XRF analysis is its ability to perform accurate quantitative analysis over a wide range of elements with relative ease. In addition, its high sensitivity makes it ideal for trace elemental analysis. The establishment of analytical conditions for XRF is straightforward, including the determination of spectral line overlap correction factors. As with mo...
— We present Chandra and VLT observations of the X−Ray Flash XRF 040812. The X−ray analysis reveals with high precision the position of a hard, fading source. A careful analysis of our I−band VLT images taken starting 17 hours after the burst led to the discovery of the optical afterglow superimposed to a bright (I = 21.5) host galaxy. The optical afterglow is seen decaying with an index of 1.1...
Wilson's disease (WD) is a rare autosomal recessive disease due to mutations of the gene encoding the copper-transporter ATP7B. The diagnosis is hampered by the variability of symptoms induced by copper accumulation, the inconstancy of the pathognomonic signs and the absence of a reliable diagnostic test. We investigated the diagnostic potential of X-ray fluorescence (XRF) that allows quantitat...
XRF (X-ray fluorescence) is a powerful technique for elemental analysis with a high sensitivity. The resolution is presently limited by the size of the primary excitation X-ray beam. A test-bed for confocal-type XRF has been developed to estimate the ultimate lateral resolution which could be reached in chemical mapping using this technique. A polycapillary lens is used to tightly focus the pri...
The paper presents possibilities and difficulties in nondestructive analysis of small multielement single crystals performed by means of X-ray spectrometry techniques: micro-X-ray fluorescence spectrometry (μ-XRF), energy-dispersive electron probe microanalysis (ED-EPMA), and X-ray photoelectron spectroscopy (XPS). The capability of the X-ray spectroscopy techniques in elemental analysis is dem...
Confocal X-ray fluorescence (XRF) spectrometry can be used to perform three-dimensional elemental analysis, which is impossible using general micro XRF without any collimating optics in the detection channel. In this study, we designed, for first time, a new confocal line (C-L-XRF) system that obtain information of larger area and higher intensity analysis than conventional point (C-P-XRF) anal...
A new method to measure the trace elemental composition of size-resolved airborne particles that uses acetone extraction followed by ICPMS analysis is compared to three other established methods: copper anode XRF, molybdenum anode XRF, and an ICPMS method that uses HF digestion. The method detection limit (MDL), accuracy, and precision of each method is studied through the analysis of ambient s...
Non-destructive analysis of cultural objects by micro-XRF spectrometry is an advantageous multi-element technique that has rapidly developed during the past few years. Portable instruments contribute significantly to the in situ analysis of valuable cultural objects, which cannot be transported to the laboratory. Ancient ceramics are the most common archaeological findings and they carry a sign...
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