Doped lithium fluoride monochromator for X-ray analysis
AssigneeSaint-Gobain Cristaux Et Detecteurs
InventorsGuillaume Gautier, Philippe Derouineau
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Abstract
The invention relates to a crystalline lithium fluoride doped with at least 0.018 mol per kg of a divalent positive ion M present in the fluoride state, in particular of the single-crystal type. The ion may be Mg2+, Zn2+ or Co2+. This fluoride has a high reflectivity and intense radiation that can emanate therefrom may be effectively received by a fast light scintillator, especially of the rare-earth halide type. It is particularly useful as a monochromator for X-ray fluorescence radiation for the purpose of elemental analysis.
Claims36
An analyzer, comprising:
- a monochromator that receives X-ray radiation emitted by a sample and reflects and refracts the X-ray radiation to create diffraction lines;
- and
- a detector that receives the diffraction lines and converts the diffraction lines into an electrical signal;
- wherein:
- the monochromator comprises a single-crystal lithium fluoride doped with at least 0.018 mol per kg of a divalent positive ion M present in a fluorinated state;
- and
- the analyzer is configured to perform elemental analysis of the sample.
A process for performing elemental analysis of a sample, comprising:
- exciting the sample with a primary X-ray beam so that the sample emits a second X-ray beam by fluorescence;
- reflecting and refracting the second X-ray beam into diffraction lines with a monochromator;
- and
- detecting the diffraction lines and converting the diffraction lines into an electrical signal with a detector;
- wherein the monochromator comprises a single-crystal lithium fluoride doped with at least 0.018 mol per kg of a divalent positive ion M present in a fluorinated state.
A single-crystal lithium fluoride doped with 0.023 to 0.082 mol per kg of a divalent positive ion M present in the fluorinated state, wherein essentially all M ions are in the single-crystal cation lattice.
Dependencies are inferred from the claim text.