A5015102078- Geological and Geochemical Analysis
- Astro and Planetary Science
- Planetary Science and Exploration
- Nuclear Physics and Applications
- Cultural Heritage Materials Analysis
- X-ray Spectroscopy and Fluorescence Analysis
- High-pressure geophysics and materials
- Polar Research and Ecology
- Building materials and conservation
- Geomagnetism and Paleomagnetism Studies
- Paleontology and Stratigraphy of Fossils
- Advanced X-ray and CT Imaging
- X-ray Diffraction in Crystallography
- Paleopathology and ancient diseases
- Archaeology and ancient environmental studies
- Geology and Paleoclimatology Research
- Geochemistry and Geochronology of Asian Mineral Deposits
- Spacecraft and Cryogenic Technologies
- earthquake and tectonic studies
- Methane Hydrates and Related Phenomena
- Conservation Techniques and Studies
Ghent University
2018-2024
Abstract A fundamental parameter-based quantification scheme for confocal XRF was applied to sub-micron synchrotron radiation X-ray fluorescence (SR-XRF) data obtained at the beamline P06 of Deutsches Elektronen-Synchrotron (DESY, Hamburg, Germany) from two sections C0033-01 and C0033-04 that were wet cut rock fragment C0033 collected Cb-type asteroid (162173) Ryugu by JAXA’s Hayabusa2 mission. Trace-element quantifications show bulk matrix is CI-like, whereas individual mineral grains...
Detection of rare earth elements (REE) is commonly performed with destructive techniques such as (LA)-ICPMS or coupled to a sample preparation. When investigating unique geological samples, cometary, asteroidal, interstellar material from return missions inclusions in deep Earth diamonds, nondestructive method preferred. The presented highly sensitive wavelength-dispersive X-ray fluorescence spectroscopy (WD-XRF) technique designed measure the L-lines REE between 4.5 and 7 keV sensitivity...
Millimetre-sized primordial rock fragments originating from asteroid Ryugu were investigated using high energy X-ray fluorescence spectroscopy, providing 2D and 3D elemental distribution quantitative composition information on the microscopic level. Samples collected in two phases sites safely returned to Earth by JAXA's explorer Hayabusa2, during which time material was stored maintained free terrestrial influences, including exposure Earth's atmosphere. Several grains of interest...
Abstract Reliable identification of chondrules, calcium‐aluminum‐rich inclusions (CAIs), carbonate grains, and Ca‐phosphate grains at depth within untouched, unprepared chondritic samples by a nondestructive analytical method, such as synchrotron X‐ray fluorescence (SXRF) computed tomography (CT), is an essential first step before intrusive sample preparation methods are performed. The detection local Ca‐enrichment could indicate the presence component, all which contain Ca major element...
The nondestructive investigation of millimeter-sized meteoritic materials is often hindered by self-absorption effects. Using X-ray-based analytical methods, the information depth for many elements (Z < 30) in range up to only a few hundred micrometers, and low-Z 20), this reduced even further tens micrometers. However, these elements, particular calcium, aluminum, magnesium, great importance planetary geologists cosmochemists, as are regularly used characterize identify specific features...
Abstract Apatite is present as an accessory phase in many meteorites and often formed a secondary product of aqueous alteration. Its propensity to incorporate rare earth elements (REE) results apatite usually being the main REE‐bearing hydrously altered meteorites. Asteroid Ryugu thought have experienced pervasive alteration material collected from surface expected provide insight into asteroidal processes without influence by terrestrial weathering. Morphologies mineral associations grains...
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 cosmo-geological (return) samples examined. With proposed wavelength dispersive synchrotron radiation X-ray fluorescence spectroscopy technique element characteristic L-lines, situated between 4.65 and 7.66 keV, can be qualitatively quantitatively detected in a nondestructive manner samples. The...
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