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Showing 1 to 20 of 29 for “"PIXE"”.
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Thick target pixe analysis
… data proved to be a valuable tool. Two modes of PIXE application, macro-mode and micro-mode, were evaluated at different ion bombarding energies ranging from 1 to 85 MeV. Experimental X-ray production cross sections at 66 and 85 MeV were evaluated and found to correlate well with theory based on …
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Pixe analysis of adjacent elements
Proton induced X-ray emission (PIXE) analysis depends on the accurate stripping of the peaks of individual X-rays from the X-ray energy spectrum produced by the bombardment of a target material with charged particles. The energy separation between the Kᵦ X-ray of element Z and the Kα X-ray of …
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ANALYTICAL APPLICATIONS OF PARTICLE INDUCED X-RAY EMISSION (PIXE) SPECTROSCOPY
… analysis using Particle Induced X-ray Emission (PIXE) using 1 and 2 MeV proton bombardment on thin targets has been achieved. The method is based on the calculation of atomic ratios from experimentally determined relative x-ray efficiency curves. Sample preparation techniques involving digestion …
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Development of an on-demand beam pulsing system for Pixe-analysis of thick targets
… developnent of a proton irduced X-ray emission (PIXE) analysis system and a multi-sample scattering chamber facility. The characteristics of the beam pulsing system and its counting rate capabilities were evaluated by observing the ion-induced X-ray emission from pure thick copper targets, with …
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Multienergetic External-beam PIXE as a Means of Stydying the Surface Enrichment Effect in Coins
… examines the feasibility of using external-beam PIXE to study the surface enrichment effect in metal artifacts. By varying the energy of the incident proton beam, we penetrated the artifact's surface to different levels and were able to produce a depth profile of the elemental composition of the …
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Micro PIXE analyses of Furnace and Converter Mattes for the determination of trace element distribution and concentrations
… matte phases by Particle Induced X-ray emission (PIXE) were performed to investigate the distribution and concentration of trace elements. These levels of sensitivity are beyond that of the electron microprobe. The objective of these analyses was to examine low level concentrations (ppm or ppb) in …
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A comparison of the Nickel and the conventional geothermometers with respect to the Jagersfontein and the Matsoku kimberlite peridotite xenolits
… Thus, Ni compositions of garnets determined by PIXE, LA-ICP-MS and SIMS were compared to select the most 'reliable' dataset. Four matrix-matched secondary garnet standards were developed for the cross-checking and testing of the accuracy of data. The standards were developed by multi-method …
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The application of Bayesian statistics and maximum entropy to Ion beam analysis techniques
… (RBS) and Proton Induced X-ray Emission (PIXE) spectra are compared to the results from other deconvolution techniques, namely Fourier Transforms, Jansson's method and maximum entropy (MaxEnt) without pixons. All the deconvolution techniques show an improvement in the resolution of the RBS …
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Light-sensing in bacteria
… bacteria: PpaA in Rhodobacter sphaeroides, PixD-PixE in Synechocystis sp. PCC, and the known light-receptors in Rhodospirillum centenum. PpaA from R. sphaeroides had previously been shown to be a heme-binding protein, despite its sequence similarity to cobalamin-binding proteins. My research …
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Dealing with contaminated land in the ‘New Regime’: an appraisal of the use of plants as biomonitors for metal contamination analysis and risk assessment for a former landfill site in Greenwich
… (LAICPMS) and Proton Induced X-Ray Emission (PIXE). From the plant analysis, the elements present in highest amount were lead, zinc and cooper. The mobility of lead could be monitored by bramble and nettle leaves; that of copper by nettle roots and bramble leaves and that of zinc by nettle …
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Régészeti obszidiánok forrásterületének meghatározása
… (NAA, ICP-OES, ICP-AES, LA-ICP-MS, PIGE, PIXE, PGAA), különös tekintettel a vizsgálati eredményeknek a proveniencia vizsgálatokban való felhasználhatóságukat. Végül néhány konkrét vizsgálaton keresztül, irodalmi példák segítségével bemutattam a fő- és nyomelemek, elempárok és hányadosok …
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Electrochemical investigation of platinum nanoparticles supported on carbon nanotubes as cathode electrocatalysts for direct methanol fuel cell
… microscopy (SEM), proton induced x-ray emission (PIXE), scanning electrochemical microscopy (SECM) and Brunauer-Emmett Tellar (BET) were also used.
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The development of the national accelerator centre proton microprobe as an analytical tool in geochemistry
… the analysis of Proton Induced X-ray Emission (PIXE) spectra, interpreted with the help of the GeoPIXE software package. The use of the Si(Li) energy dispersive detector provides simultaneous multi-element detection at the parts-per-million (ppm) level, and a scanning beam facility permits trace …
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SET-UP OF INNOVATIVE EXPERIMENTAL METODOLOGIES FOR THE ATMOSPHERIC AEROSOL CHARACTERISATION AND SOURCE APPORTIONMENT
… were validated by an inter-comparison with PIXE technique (Particle Induced X-Ray Emission), usually used for size-segregated samples analysis. The developed ED-XRF set-up allows to obtain size-segregated elemental characterisation using a more widespread, cheap, and easy-to-use technique …
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Numerical modeling study of a neutron depth profiling (NDP) system for the Missouri S&T reactor
… calculations to simulate a proposed NDP-PIXE apparatus at MSTR. In addition, the possibility of implementing an Artificial Neural Network to perform automated data analysis of NDP is presented. It was found that the performance of the Artificial Neural Network is at least as accurate as …
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TOF-SIMS analyses of interplanetary dust particles
… Untersuchungsergebnisse von TOF-SIMS mit PIXE- und SEM-Analysen identischer IDPs in Verbindung zu bringen, aufgrund der sehr unterschiedlichen Informationsvolumina ein schwieriges Problem. Eine vollständige Interpretation aller Daten wird erst nach weiteren TEM-Studien möglich sein.
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