| 摘要 |
A method for determining the concentration of an element in a material, such as heavy elements like mercury, lead, uranium, plutanium, tungsten or gold in a light matrix material like coal or refined oils, that can be performed as an online measurement and that makes it possible to precisely determine even very low concentrations, especially below 0,1%, is provided. According to the Invention the characteristic absorption is measured using a technique such as X-ray absorption spectroscopy (e.g. XAS, XANES, EXAFS). This measurement takes advantage of the fact that the absorption of an element significantly rises when the energy of the irradiating beam goes beyond an characteristic absorption edge of the element. So, according to the invention, the difference between the intensity of the transmitted X-ray beam in an energy interval above the absorption edge and in an energy interval below the absorption edge is determined. |
