X-RAY SYSTEM AND METHODS WITH DETECTOR INTERIOR TO FOCUSING ELEMENT

摘要

An X-ray fluorescence instrument in which x-rays are directed from a source onto a sample by a focusing element. Fluorescence from the sample is detected by an x-ray detector disposed entirely within a volume "interior" to the focusing element, as defined in the description of the invention. A second focusing element may collect emission by the sample and direct it monochromatically, over a large opening angle, onto the x-ray detector. Methods for applying the instrument, particularly for the quantification of sulfur and other contaminating elements in lubricants and fuel are also provided.