A5009233355- X-ray Spectroscopy and Fluorescence Analysis
- Advanced X-ray Imaging Techniques
- Trace Elements in Health
- Heavy metals in environment
- Advanced X-ray and CT Imaging
- Advanced Electron Microscopy Techniques and Applications
- Plant Micronutrient Interactions and Effects
- Geological and Geochemical Analysis
- Crystallography and Radiation Phenomena
- Heavy Metal Exposure and Toxicity
- CO2 Sequestration and Geologic Interactions
- Geochemistry and Geologic Mapping
- Nuclear Physics and Applications
- Radioactive element chemistry and processing
- Mine drainage and remediation techniques
- Aluminum toxicity and tolerance in plants and animals
- Radiation Shielding Materials Analysis
- Electron and X-Ray Spectroscopy Techniques
- High-pressure geophysics and materials
- Coal and Its By-products
- Geochemistry and Elemental Analysis
- Arsenic contamination and mitigation
- Hydrocarbon exploration and reservoir analysis
- Laser-Plasma Interactions and Diagnostics
- Selenium in Biological Systems
Australian Synchrotron
2016-2025
Australian Nuclear Science and Technology Organisation
2017-2025
Barking and Dagenham College
2019
Clayton Foundation
2015-2016
University of South Australia
2011-2012
Cooperative Research Centre for Contamination Assessment and Remediation of the Environment
2011-2012
The University of Queensland
2011-2012
Agriculture and Food
2011-2012
Ohio Environmental Protection Agency
2011
Environmental Protection Agency
2011
The in situ or authigenic formation of calcium phosphate minerals marine sediments is a major sink for the vital nutrient phosphorus. However, because typical sediment chemistry not kinetically conducive to precipitation these minerals, mechanism behind their has remained fundamental mystery. Here, we present evidence from high-sensitivity x-ray and electrodialysis techniques describe by which abundant diatom-derived polyphosphates play critical role sediments. This can explain puzzlingly...
A hard x‐ray micro‐nanoprobe has commenced operation at the Australian Synchrotron providing versatile fluorescence microscopy across an incident energy range from 4 to 25 keV. Two probes are used collect μ‐XRF and μ‐XANES for elemental chemical microanalysis: a Kirkpatrick‐Baez mirror microprobe micron resolution studies Fresnel zone plate nanoprobe capable of 60‐nm resolution. Some unique aspects beamline design discussed. An advanced dispersive detection scheme named Maia been developed...
Motivated by the challenge of capturing complex hierarchical chemical detail in natural material from a wide range applications, Maia detector array and integrated realtime processor have been developed to acquire X-ray fluorescence images using Fluorescence Microscopy (XFM).Maia has deployed initially at XFM beamline Australian Synchrotron more recently, demonstrating improvements energy resolution, P06 Petra III Germany.Maia captures fine element beyond 100 M pixels.It combines large...
We present an x-ray coherent diffractive imaging experiment utilizing a nonplanar incident wave and demonstrate success by reconstructing nonperiodic gold sample at 24 nm resolution. Favorable effects of the curved beam illumination are identified.
Fluctuation microscopy is a hybrid diffraction-imaging technique that detects medium range order in amorphous materials by examining spatial fluctuations coherent scattering. These appear as speckle images and diffraction patterns. The volume of material contributing to the determined point-spread function (the resolution) imaging optics sample thickness. periodicities being probed are related vector. Statistical analysis allows random non-random (ordered) contributions be discriminated....
The Maia detector system is engineered for energy dispersive x‐ray fluorescence spectroscopy and elemental imaging at photon rates exceeding 107/s, integrated scanning of samples pixel transit times as small 50μs high definition images 108 pixels real‐time processing detected events spectral deconvolution online display pure images. developed by CSIRO BNL combines a planar silicon 384 array, application‐specific circuits pulse shaping peak detection sampling optical data transmission to an...
Eucalyptus trees may translocate Au from mineral deposits and support the use of vegetation (biogeochemical) sampling in exploration, particularly where thick sediments dominate. However, biogeochemistry has not been routinely adopted partly because biotic mechanisms migration are poorly understood. For example, although previously measured plant samples, there doubt as to whether it was truly absorbed rather than merely adsorbed on surface aeolian contamination. Here we show first evidence...
Understanding the accumulation and distribution of essential nutrients in cereals is primary importance for improving nutritional quality this staple food. While recent studies have improved understanding micronutrient loading into barley grain, a detailed characterization micronutrients within grain still lacking. High-definition synchrotron X-ray fluorescence was used to investigate association elements at micro scale. Micronutrient scutellum embryo shown be highly variable between...
Abstract The phytotoxicity of trace metals is global concern due to contamination the landscape by human activities. Using synchrotron-based x-ray fluorescence microscopy and absorption spectroscopy, distribution speciation copper (Cu), nickel (Ni), zinc (Zn) was examined in situ using hydrated roots cowpea (Vigna unguiculata) exposed 1.5 μm Cu, 5 Ni, or 40 Zn for 1 24 h. After h exposure, most Cu bound polygalacturonic acid rhizodermis outer cortex, suggesting that binding walls cells...
Phosphorus K-edge X-ray absorption near-edge structure (XANES) spectroscopy was performed on phosphate mineral specimens including (a) twelve from the apatite group covering a range of compositional variation and crystallinity; (b) six non-apatite calcium-rich minerals; (c) 15 aluminium-rich (d) ten minerals rich in either reduced iron or manganese; (e) four oxidized (f) eight magnesium, copper, lead, zinc rare-earth elements; (g) uranium minerals. The identity all examined this study...
The usefulness of zinc oxide (ZnO) nanoparticles has led to their wide distribution in consumer products, despite only a limited understanding how this nanomaterial behaves within biological systems. From nanotoxicological viewpoint the interaction(s) ZnO with cells immune system is specific interest, as these nanostructures are readily phagocytosed. In study, rapid scanning X-ray fluorescence microscopy was used assay number associated ∼1000 individual THP-1 monocyte-derived human...
The X-ray fluorescence microscopy (XFM) beamline is an in-vacuum undulator-based (XRF) microprobe at the 3 GeV Australian Synchrotron. delivers hard X-rays in 4–27 keV energy range, permitting K emission to Cd and L M for all other heavier elements. With a practical low-energy detection cut-off of approximately 1.5 keV, low- Z constrained Si, with Al detectable under favourable circumstances. has two scanning stations: Kirkpatrick–Baez mirror microprobe, which produces focal spot 2 µm ×...
Abstract Accelerated carbonation of ultramafic mine tailings has the potential to offset CO2 emissions produced by mining ores from Cu-Ni-platinum group element, podiform chromite, diamondiferous kimberlite, and historical chrysotile deposits. Treatments such as acid leaching, reaction with elevated concentrations gaseous CO2, optimization pore water saturation have been shown enhance sequestration rates in laboratory settings. The next challenge is deploy treatment technologies on pilot...
Abstract Aberrant self-assembly and toxicity of wild-type mutant superoxide dismutase 1 (SOD1) has been widely examined in silico, vitro transgenic animal models amyotrophic lateral sclerosis. Detailed examination the protein disease-affected tissues from sclerosis patients, however, remains scarce. We used histological, biochemical analytical techniques to profile alterations SOD1 deposition, subcellular localization, maturation post-translational modification post-mortem spinal cord cases...
We discuss contrast formation in a propagating x-ray beam. consider the validity conditions for linear relations based on transport-of-intensity equation (TIE) and transfer functions (CTFs). From single diffracted image, we recover thickness of homogeneous object which has substantial absorption phase-shift --0.37 radian.
Motivated by the need for megapixel high definition trace element imaging to capture intricate detail in natural material, together with faster acquisition and improved counting statistics elemental imaging, a large energy‐dispersive detector array called Maia has been developed CSIRO BNL SXRF on XFM beamline at Australian Synchrotron. A 96 prototype demonstrated capacity of system real‐time deconvolution complex spectral data using an embedded implementation Dynamic Analysis method...
Phosphorus availability is often a limiting factor for crop production around the world. The efficiency of P fertilizers in calcareous soils limited by reactions that decrease availability; however, fluid have recently been shown, highly southern Australia, to be more efficient (wheat [ Triticum aestivum L.]) nutrition than granular products. To elucidate mechanisms responsible this differential response, an isotopic dilution technique ( E value) coupled with synchrotron‐based spectroscopic...
Metals and metalloids play a key role in plant other biological systems as some of them are essential to living organisms all can be toxic at high concentrations. It is therefore important understand how they accumulated, complexed transported within plants. In situ imaging metal distribution physiological relevant concentrations highly hydrated technically challenging. the case roots, this mainly due possibility artifacts arising during sample preparation such cross sectioning. Synchrotron...