Apparatus for selecting products on the basis of their composition by X ray fluorescent spectroscopy and corresponding selection method

A method for selecting products on the basis of their composition via X-ray fluorescence spectroscopy that uses an apparatus for selecting products on the basis of their composition via X-ray fluorescence spectroscopy, comprising

• emitting an X-ray beam from an X-ray source towards a product sample, and
• receiving at a particle detector an X-ray beam diffused by said product sample and
• generating a received signal suitable to be analysed to determine a chemical composition of said product sample and
• selecting a type of product corresponding to said chemical composition of the product sample,
• wherein
• a bottom portion of said apparatus facing said product sample comprises an output window facing the product sample, an axis of said X-ray beam and an observation axis of the detector passing through said output window,
• it comprises a first vacuum chamber located between said output window of the apparatus facing the product sample and said X-ray source on said axis of said X-ray beam, and a second vacuum chamber located between said output window of the apparatus facing the product sample and said detector on said observation axis of the detector,
• comprising rotating said axis of said X-ray beam and said observation axis about respective axes of rotation perpendicular to the plane they lie within by a system of variation of angle (a) between the axis of said X-ray beam of said X-ray source and the observation axis of said detector, comprised in said apparatus.