Stefanos Margis is a PhD researcher within the Nuclear Medicine group at Radboud University Medical Center. His PhD project is project is focused on the dosimetry of Targeted Radionuclide Therapy (TRT) in cancer within the UNRANU consortium, under the supervision of Frank Nijsen, Sandra Heskamp, Mark Konijnenberg, Giulia Tamborino and Konstantinos Chatzipapas. More precisely, his research focuses on the development of computation models based on GEANT4 Monte Carlo code to calculate absorbed doses in 2D and 3D for in-vitro and in-vivo experiments. The aim of his work is to link the simulated absorbed dose with experimental biological data, contributing to a deeper understanding of the relationship between radiation absorbed dose and biological response in targeted radionuclide therapy.