Characteristics of the natural radioactivity of the underground laboratories in the Baltic Sea Region participating in the BSUIN and EUL projects

Underground laboratories (ULs) offer more and more opportunities for their usage. Still, one of the most critical parameters describing ULs is their natural radioactivity. Therefore, the article compares the six ULs of the BSUIN (Baltic Sea Underground Innovation Network) and EUL (Empowering Underground Laboratories Network Usage) projects regarding their natural radioactivity. Measurements include in situ and laboratory analysis of the collected rock and water samples, using various nuclear spectrometry techniques. The lowest level of natural radioactivity characterizes salt deposit is in the Conceptual Lab development coordinated by KGHM Cuprum R&D centre