3D Mikro-Röntgenfluoreszenzanalyse

Abstract

This thesis introduces a new setup which extends the capabilities of X-ray spectroscopy. A confocal alignment of two polycapillary X-ray lenses facilitates three dimensional resolved X-ray fluorescence analysis (3D micro-XRF). With a spatial resolution of down to around 10 µm to 20 µm the determination of elemental densities is feasible nondestructively. Even information on the chemical state of elements can be obtained by exploring the X-ray Absorption Fine Structure (3D micro-XAFS) of elements of interest.The two modes, XRF and XAFS, of this new 3D analysis, their already successful application and their prospects as well as their restrictions and problems are portrayed with a detailed example of application for each one. We investigated paint layers and under glaze paintings, historical artifacts both of them, in order to throw light on the process of their production.Most of these experiments were performed with a synchrotron radiation source, but we also built up a 3D micro-XRF experiment with an X-ray tube. So far, 3D micro-XRF and 3D micro-XAFS prooved to be capable of providing valuable analytical results. Semiquantitative evaluations of depth profiling measurements were performed and the developments leading beyond that give hope that an entirely quantitative evaluation may be within reach soon.