Improved micro x-ray fluorescence spectrometer for light element analysis

Smolek, S.; Streli, Christina; Zoeger, N.; Wobrauschek, P.

doi:10.1063/1.3428739

Cited by 26 publications

(17 citation statements)

References 5 publications

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“…Such a micro-spectrometer, designed for improved analysis of light elements, has been installed at the Atominstitut in Vienna. 2 Confocal micro-XRF introduces a second x-ray optics (usually a polycapillary half lens x-ray optics) in front of the energy dispersive x-ray (EDX) detector. By overlapping the two foci of the optics on the sample a well-defined measurement volume is created.…”

Section: Introductionmentioning

confidence: 99%

Confocal micro-x-ray fluorescence spectrometer for light element analysis

Smolek

Pemmer²,

Zoeger³

et al. 2012

Review of Scientific Instruments

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An existing micro-x-ray fluorescence (micro-XRF) spectrometer designed for light element analysis (6 ≤ Z ≤ 14) has been extended to confocal geometry: a second polycapillary x-ray optic has been introduced in front of the energy dispersive x-ray detector. New piezo positioners for optimum alignment of both optics have been installed inside the vacuum chamber. The spectrometer offers now the possibility of true 3D elemental analysis in the micrometer regime. Depth resolution varies between 100 μm at 1 keV fluorescence energy (Na-Kα) and 30 μm for 17.5 keV (Mo). To further extend analytical capabilities a second x-ray tube with a Rh anode has been acquired to supplement to existing Mo anode tube. Lower limits of detection have been determined to be in the ppm region for confocal geometry. The spectrometer has been characterized and tested using different samples. Furthermore, results have been compared with SR micro-XRF to show the capabilities and limitations of this spectrometer.

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Section: Introductionmentioning

confidence: 99%

Confocal micro-x-ray fluorescence spectrometer for light element analysis

Smolek

Pemmer²,

Zoeger³

et al. 2012

Review of Scientific Instruments

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“…Another option to determine beam diameters would be to use a thin wire [23] or microscopic dried deposits. [24] The polycapillary optic reflects the radiation completely onto the sample.…”

Section: Resultsmentioning

confidence: 99%

A new micro X‐ray fluorescence spectrometer for in vivo elemental analysis in plants

et al. 2017

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aIn vivo micro X-ray fluorescence (micro-XRF) on plants is aimed at mapping spatial ion accumulation, eg. in plant leaves to minimize artifacts arising from sample preparation and to be able to detect changes occurring under environmental stress. To obtain reliable results, a spectrometer and sample setup that maintain the plant in good physiological condition are necessary. We have built a micro-XRF spectrometer, in which analyses are performed in air, thereby allowing for in vivo micro-XRF measurements in plants. Mapping is performed with full spectrum acquisition in each pixel and is automated and controlled by computer software developed for this micro-XRF unit. Limits of detection were found to be comparable to those found previously at second-generation synchrotron facilities using a freestanding film reference from 0.04 ng/mm 2 for Fe to 0.20 ng/mm 2 for Pb. The spot size was determined to be less than 14 μm at Rh Kα line (20.214 keV). Relative sensitivities were determined for elements from S to Pb using the freestanding film reference and a 13-element standard dried droplet deposition. For in vivo measurements, a dedicated sample holder was developed by 3-D printing. Here, we present the in vivo elemental analysis capabilities of our micro-XRF spectrometer by mapping elements in Arabidopsis thaliana plants and by assessing their physiological state before and after scanning.

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“…The detailed description of the setup can be found in previous publications [34,35]. Excellent excitation conditions for the measurements of light and heavy elements are provided by a Rh-anode low power tube (20 W).…”

Section: Methodsmentioning

confidence: 99%

µXRF Elemental Mapping of Bioresorbable Magnesium-Based Implants in Bone

et al. 2016

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This study investigated the distribution of the elemental constituents of Mg-based implants at various stages of the degradation process in surrounding bone tissue, with a focus on magnesium (Mg), as the main component of the alloy, and yttrium (Y), due to its potential adverse health effects. The measurements were performed on the implant-bearing thin sections of rat bone in a time series of implant degradation between one and 18 months. Micro X-ray fluorescence analysis (μXRF) with a special spectrometer meeting the requirements for the measurements of low-Z elements was used. It was found that the migration and accumulation behaviour of implant degradation products is element-specific. A sharp decrease in Mg was observed in the immediate vicinity of the interface and no specific accumulation or aggregation of Mg in the adjacent bone tissue was detected. By contrast, Y was found to migrate further into the bone over time and to remain in the tissue even after the complete degradation of the implant. Although the nature of Y accumulations must still be clarified, its potential health impact should be considered.

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Improved micro x-ray fluorescence spectrometer for light element analysis

Cited by 26 publications

References 5 publications

Confocal micro-x-ray fluorescence spectrometer for light element analysis

Confocal micro-x-ray fluorescence spectrometer for light element analysis

A new micro X‐ray fluorescence spectrometer for in vivo elemental analysis in plants

µXRF Elemental Mapping of Bioresorbable Magnesium-Based Implants in Bone

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