Creation of reliable spectral databases for the characterisation of radionuclide solid phases: Investigation of radionuclide mineralisation under environmental and repository conditions. Comprehensive characterisation of solid phases by XRD, EXAFS, XANES, TRLFS, FTIR, Raman and ion beam techniques. Study of the dynamics of radionuclides under environmental conditions: Improvement of purification procedures leading to selective and sensitive methods for the determination of radionuclides at ultra-trace levels by ICP-MS . Investigation of procedures for the removal of isobaric interferences on ICP-MS. Development of non-separative speciation schemes by combination of advanced spectroscopic techniques and multivariate statistics