APPARATUS FOR UNDERWATER X-RAY FLUORESCENCE ANALYSIS Russian patent published in 2015 - IPC G01N23/223 

FIELD: physics.

SUBSTANCE: X-ray fluorescence analyser comprises, in an insulated housing, a primary X-ray source, a collimator configured to form a collimated beam of primary X-rays in the form of a sheet-like beam, and a liquid sample fluorescent radiation detector, mounted such that their optical axes lie in one plane; the sampling device used is a plunger, one end of which enters a liquid inlet/outlet channel while ensuring air-tightness of an external pressure-resistant housing, wherein the surface of the plunger has a flat area with incisions in the form of grooves with flat walls which are parallel to each other, and the plunger is arranged to ensure orientation of the incisions parallel to the plane of the optical axes of the X-ray source, the collimator and the fluorescent radiation detector, wherein the mutual arrangement of the collimator and the plunger provide an angle of total external reflection of the collimated beam of primary X-rays from the flat area of the plunger with incisions, and the dimensions of the flat area of the plunger with incisions are comparable with cross-sectional dimensions of the collimated beam of primary X-rays.

EFFECT: improved performance of the apparatus when conducting real-time underwater X-ray fluorescence analysis without sample preparation and in conditions with variable dynamic loads.

11 cl, 3 dwg, 2 tbl