High-resolution X-ray fluorescence microtomography of homogeneous samples

First experimental results of fluorescence microtomography with 6-mum resol ution obtained at ESRF, Grenoble, France, are described. The setup comprise s high-quality optics (monochromator, mirror, focusing lenses) coupled to t he high-energy/brilliance/coherence of the ID 22 undulator beamline. The to mographic setup allows precise measurements in the "pencil-beam" geometry. The image reconstruction is based on a modification of the algebraic recons truction method but includes simplifications of the model. The quality and precision of the two-dimensional reconstructed elemental images of a phanto m sample are encouraging. The method will be further refined and applied fo r the analysis of more complex inhomogeneous samples.