Researcher at the Campus Tecnológico e Nuclear /IST (Lisbon University). The scientific activity has been developed in the use of environmental isotopes in hydrogeology, hydrogeochemistry, palaeohydrology and climate research studies. Special emphasis has been put on the use of the 2H/1H, 13C/12C,15N/14N, 18O/16O ratios and variation of 3H and 14C content in groundwaters systems. Participation in several R&D National and International Projects, which allowed to assess answers related to the identification of salts contamination in groundwaters (natural or induced by man), interconnection between aquifers, delimitation of recharge areas, in the reconstruction of palaeoclimatic environments and groundwater dating. Author/co-author of several scientific papers published papers in Scientific Journals, Books and International Conferences Proceedings.