FIELD: physics.
SUBSTANCE: apparatus (1) for X-ray fluorescence analysis of a mineral sample includes: an X-ray source (2) for generating an X-ray beam to irradiate the mineral sample; at least one fluorescence detector (4,5) for measuring fluorescent radiation emitted by the mineral sample when irradiated by the X-ray beam; a processing unit for providing analysis of the mineral sample based on the measurements made by said at least one fluorescence detector (4,5), wherein said apparatus (1) further includes: a sample container (3) arranged to hold the mineral sample during irradiation, wherein the sample container is arranged to provide at least two different irradiation paths through said mineral sample during irradiation, and a controller means to adjust the X-ray tube voltage of said X-ray source (2) in accordance with the length of the irradiation paths.
EFFECT: high reliability and accuracy of X-ray fluorescence analysis.
22 cl, 5 dwg
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