Main interest of my work are the interactions of rare earth elements and radioactive actinides with mammalian cells to allow for more reliable risk assessment in the event of accidental incorporation. To address this problem, various cell biological techniques (cell viability, cytotoxicity, apoptosis, and proliferation assays, immunocytochemical staining followed by fluorescence microscopy) and chemical/analytical techniques (ICP-MS, spectroscopy, especially TRLFS and LWCC-UV/vis) are used.