Quantitative elemental microscopy on lateral highly inhomogeneous meteorite samples using ion beam analysis

Wunderlich, Ralf; Klingner, Nico; Vogt, J.; Spemann, D.

doi:10.1016/j.nimb.2012.11.048

Cited by 3 publications

(3 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…With respect to quantification, effects similar to detector dead time have to be considered for further development of the system. In particular, inhomogeneous samples including hot spots of some elements may impair the linearity of the sensitivity of the detector.…”

Section: Resultsmentioning

confidence: 99%

Enhancements in full‐field PIXE imaging—Large area elemental mapping with increased lateral resolution devoid of optics artefacts

et al. 2018

View full text Add to dashboard Cite

The combination of a pn‐junction charge‐coupled device‐based pixel detector with a poly‐capillary X‐ray optics was installed and examined at the Helmholtz‐Zentrum Dresden‐Rossendorf. The set‐up is intended for particle‐induced X‐ray emission imaging to survey the trace elemental composition of flat/polished geological samples. In the standard configuration, a straight X‐ray optics (20 μm capillary diameter) is used to guide the emitted photons from the sample towards the detector with nearly 70 000 pixels. Their dimensions of 48 × 48 μm2 are the main limitation of the lateral resolution. This limitation can be bypassed by applying a dedicated subpixel algorithm to recalculate the footprint of the photon's electron cloud in the detector. The lateral resolution is then mainly determined by the capillary's diameter. Nevertheless, images are still superimposed by the X‐ray optics pattern. The optics' capillaries are grouped in hexagonal bundles resulting in a reduced transmission of X‐rays in the boundary regions. This influence can be largely suppressed by combining a series of short measurements at slightly shifted positions using a precision stage and correcting the image data for this shifting. The use of a subpixel grid for the image reconstruction allows a further increase of the spatial resolution. This approach of image‐stacking and multiframe super‐resolution in combination with the subpixel correction algorithm is presented and illustrated with experimental data. Additionally, a flat‐field correction is shown to remove the remaining imaging inhomogeneity caused by non‐uniform X‐ray transmission. The described techniques can be used for all X‐ray spectrometry methods using an X‐ray camera to obtain high‐quality elemental images.

show abstract

Section: Resultsmentioning

confidence: 99%

Enhancements in full‐field PIXE imaging—Large area elemental mapping with increased lateral resolution devoid of optics artefacts

et al. 2018

View full text Add to dashboard Cite

show abstract

“…As part of an investigation into meteorite samples, Wunderlich et al . () describe a solution for correcting the lateral dead time based on a noise‐triggered pulse generator. Silicate and oxide crystals located in the close proximity of massive Fe‐Ni grains are a challenge for IBA mapping due to the strongly varying dead time of the detector electronics, leading to inaccurate quantitative PIXE and RBS maps on highly heterogeneous samples.…”

Section: Advances In Accelerator‐based Methods (Contribution By: R Bmentioning

confidence: 99%

“…Wunderlich et al . () compared the number of generated and processed pulses, thereby generating a dead‐time map that was then used to correct the collected spectrum on a pixel‐per‐pixel basis. In addition, recording the dead‐time map allowed the use of high‐beam currents providing higher counting rates and leading to a reduction in the overall measurement time.…”

Section: Advances In Accelerator‐based Methods (Contribution By: R Bmentioning

confidence: 99%

GGR Biennial Critical Review: Analytical Developments Since 2012

Wiedenbeck

Bèdard

Bugoi

et al. 2014

Geostandard Geoanalytic Res

View full text Add to dashboard Cite

Advances in the chemical, crystallographic and isotopic characterisation of geological and environmental materials can often be ascribed to technological improvements in analytical hardware or to innovative approaches to data acquisition and/or its interpretation. This biennial review addresses key laboratory methods that form much of the foundation for analytical geochemistry; again, this contribution is presented as a compendium of laboratory techniques. We highlight advances that have appeared since January 2012 and that are of particular significance for the chemical and isotopic characterisation of geomaterials. Prominent scientists from the selected analytical fields present publications they judge to be particular noteworthy, providing background information about the method and assessing where further opportunities might be anticipated. In addition to the well-established technologies such as thermal ionisation mass spectrometry and plasma emission spectroscopy, this publication also presents new or rapidly growing methods such as electron backscattered diffraction analysis and atom probe tomographya very sensitive method providing atomic scale information.

show abstract

GUMAP: A GUPIXWIN-compatible code for extracting regional spectra from nuclear microbeam list mode files

Russell

Campbell

Boyd

et al. 2018

Nuclear Instruments and Methods in Physics Research Section B:

View full text Add to dashboard Cite

Quantitative elemental microscopy on lateral highly inhomogeneous meteorite samples using ion beam analysis

Cited by 3 publications

References 18 publications

Enhancements in full‐field PIXE imaging—Large area elemental mapping with increased lateral resolution devoid of optics artefacts

Enhancements in full‐field PIXE imaging—Large area elemental mapping with increased lateral resolution devoid of optics artefacts

GGR Biennial Critical Review: Analytical Developments Since 2012

GUMAP: A GUPIXWIN-compatible code for extracting regional spectra from nuclear microbeam list mode files

Contact Info

Product

Resources

About