Civilian use of radionuclide data which were gotten CTBT radionuclide stations

Tomita, Yutaka ; Furuno, Akiko   ; Yamamoto, Yoichi ; Kurihara, Toshiyuki 

We are operating the National Data Center (NDC-2) in Japan Atomic Energy Agency (JAEA), and we receive and analyze data from radionuclide stations of Comprehensive Nuclear-Test-Ban Treaty (CTBT) located around the world. These data can be used not only to detect nuclear tests, but also to confirm of the presence of the accidental release of radionuclides from the nuclear facilities. We introduce in this presentation about our results of radionuclide and atmospheric dispersion analyses for a case in which CTBT monitored anthropogenic radionuclides were detected at the Stockholm station (RN63) in Sweden in June 2020. We have also analyzed data from a radionuclide station located downwind from the Zaporizhzhia NPP since its shelling in March 2022 following the Ukrainian conflict. These results will also be shown in the presentation.