Activity measurements and calculations for gamma-emitting radionuclides in concrete drill cores of unit 2 of the Greifswald NPPErik Poenitz, Quirina Isabella Roode-Gutzmer, Astrid Barkleit and Joerg KonheiserEPJ Web Conf., 308 (2024) 03005DOI: https://doi.org/10.1051/epjconf/202430803005