MIKRORONTGENSTRALE-SPEKTROMETER

摘要

The innovation concerns a construction of an instrument for analysis of trace elements in samples with a dimension in the size of mm with the use of X-ray-induced X-ray-fluorescence. The instrument consists of a microbeam of monochromatic X-rays and an X-ray detector (10) for detecting the fluorescent radiation from the sample (9). As X-ray source an X-ray tube (1) is used with a line focus (2) and the radiation is guided out to the sample by a capillary (3). By utilizing the total reflexion of X-rays which can take place inside the capillary (3), high intensity as well as an efficient suppression of high energy X-rays as compared with low energy X-rays, can be achieved. At the same time, by utilizing the selective absorption which occur for low ''take off'' angles (the angle between the capillary and the anode plane), the radiation both below (lower energy) and above (higher energy) the characteristic radiation from the anode can be effectively suppressed.