AustralieFrV1, Main, Exploration, bibRecord, 009360

Selective x-ray Bragg spectrometry : optimizing fluorescence microprobe sensitivity for precious metals

Identifieur interne : 009360 ( Main/Exploration ); précédent : 009359; suivant : 009361

Selective x-ray Bragg spectrometry : optimizing fluorescence microprobe sensitivity for precious metals

Auteurs : B. E. Etschmann [Australie] ; C. G. Ryan [Australie] ; S. Vogt [États-Unis] ; J. Maser [États-Unis] ; J. Brugger [Australie] ; C. L. Harland [États-Unis] ; D. Legnini [États-Unis]

Source :

X-ray spectrometry [ 0049-8246 ] ; 2007.

RBID : Pascal:07-0213505

Descripteurs français

Pascal (Inist)
- Spectrométrie RX, Spectrométrie fluorescence, Microsonde, Sensibilité, Appareillage, Spectrométrie fluorescence RX, Limite détection, Interférence, Constituant principal, Etat solide, Effet interélément, Artefact, Amélioration, Métal, Roche, Composé biologique.
Wicri :
- topic : Métal.

English descriptors

KwdEn :
- Artefact, Biological compound, Detection limit, Fluorescence spectrometry, Improvement, Instrumentation, Interelement effect, Interference, Major constituent, Metal, Microprobe, Rocks, Sensitivity, Solid state, X ray fluorescence spectrometry, X ray spectrometry.

Abstract

This instrument development project was aimed at developing an x-ray spectrometer configuration for the x-ray fluorescence microprobe optimized for the detection of precious metals in geological and biological samples with the objective of improving detection limits and reducing interference from major elements and the scattered beam. The approach used Bragg diffraction from a surface shaped to a log-spiral to focus x-rays of a particular energy onto a solid-state detector. The result is an enhancement of the precious metal lines within the relatively narrow bandpass of the Bragg crystal surface and suppression of interfering elements and detector artefacts, such as tailing and escape peaks arising from intense elemental lines and scattered photons. This combined enhancement resulted in a factor of 3 improvement in the count rates at the optimized energy. Combined with the reduction in background, this results in an order of magnitude improvement of the Au detection limits for samples of geological significance.

Affiliations:

Australie, États-Unis

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Le document en format XML

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<term>Fluorescence spectrometry</term>
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<term>Instrumentation</term>
<term>Interelement effect</term>
<term>Interference</term>
<term>Major constituent</term>
<term>Metal</term>
<term>Microprobe</term>
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<term>Spectrométrie fluorescence RX</term>
<term>Limite détection</term>
<term>Interférence</term>
<term>Constituant principal</term>
<term>Etat solide</term>
<term>Effet interélément</term>
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<front><div type="abstract" xml:lang="en">This instrument development project was aimed at developing an x-ray spectrometer configuration for the x-ray fluorescence microprobe optimized for the detection of precious metals in geological and biological samples with the objective of improving detection limits and reducing interference from major elements and the scattered beam. The approach used Bragg diffraction from a surface shaped to a log-spiral to focus x-rays of a particular energy onto a solid-state detector. The result is an enhancement of the precious metal lines within the relatively narrow bandpass of the Bragg crystal surface and suppression of interfering elements and detector artefacts, such as tailing and escape peaks arising from intense elemental lines and scattered photons. This combined enhancement resulted in a factor of 3 improvement in the count rates at the optimized energy. Combined with the reduction in background, this results in an order of magnitude improvement of the Au detection limits for samples of geological significance.</div>
</front>
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Selective x-ray Bragg spectrometry : optimizing fluorescence microprobe sensitivity for precious metals

Selective x-ray Bragg spectrometry : optimizing fluorescence microprobe sensitivity for precious metals

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri