Dr. R. Jaćimović, M.Sc., Ph.D. in Nuclear Technology, is presently senior researcher at the Department of Environmental Sciences at the Jožef Stefan Institute (JSI), Ljubljana Slovenia. He finished his M. Sc. and Ph. D. in Physics, at the University of Ljubljana, Faculty of Mathematics and Physics, Nuclear Engineering, Slovenia. His main activities are connected with the use of the k0-standardization method of neutron activation analysis (k0-NAA) for determination of major and micro elements in different matrices, development of nuclear and nuclear-related analytical methods, working on effective utilization of the Institute’s TRIGA Mark II research reactor for short, medium and longlived radionuclides and on certification of natural matrix reference materials from well known Institutions or Laboratories (IRMM, NIST, IAEA, BAM, etc.). He is also involved as a principal investigator or coinvestigator in international research projects, supervisor for foreign students on IAEA fellowships and as a teacher at the training programme of the Milan Čopic Training Centre at the JSI. He is author or co-author of over 110 scientific papers, 65 published scientific conference papers, 3 chapters in scientific books, 4 professional monographs, over 90 final research reports, 22 invited lectures at foreign Universities or Institutes and 15 invited lectures at international conferences. In September 2009 CDTN/CNEN (Nuclear Technology Development Centre/Brazilian Commission for Nuclear Energy), Belo Horizonte, Brazil, honoured him for supporting the Neutron Activation Group to re-establish and improve the k0- standardization method of NAA at CDTN. In October 2012 he received an honorary doctorate at the Odessa National Polytechnic University, Ukraine.