CTBT: Science and Technology Conference 2025 - SnT2025

Attribution of the radioxenon release sources, detected by SAUNA III and three SAUNA QB networks in Lithuania

P2.3-541

Not scheduled

1h

Zeremoniensaal

E-poster T2.3 Atmospheric and Subsurface Radionuclide Background and Dispersion P2.3 Atmospheric and Subsurface Radionuclide Background and Dispersion

Speaker

Dr Evaldas Maceika (Radiation Protection Centre)

Description

Radiation Protection Centre has launched a network of three SAUNA QB and one SAUNA III atmospheric radioxenon measuring stations in Lithuania. Measurements are performed regularly since the end of 2024 and the number of episodes with the elevated radioxenon (mostly 133Xe) concentrations were detected. The backward atmospheric transport modeling using HYSPLIT computer code allowed us to identify the most probable radioxenon release source, attributable to each episode of contamination. The analysis revealed that in most of the cases detected radioxenon was transported from the neighboring Belarusian NPP. In some cases, the radioxenon atmospheric releases from the medical isotope production facilities in Belgium/Netherlands and Poland were registered. Also, sources of release from the NPP in the south of Sweden as well in Ukraine and Russia were identified. The usage of the non-stop radioxenon measurements data obtained in the network of 4 different stations in Lithuania allows us to trace the detected sources of release with improved certainty.