June 26, 2023 1st IER seminar of FY2023 was held. ＜Project Lecturer IGARASHI, Project Associate Professor GUSYEV＞

Date & Time	Mon. June 26, 2023, 13:30-15:30 JST
Venue	6F Conference room, Main Bldg. IER/Online (Zoom)
Speakers	Project Lecturer, IGARASHI Yasunori Project Associate Professor, Maksym GUSYEV (Presentation order)
Lecture Title	Progress in FY2021 and plans for FY2022 (Igarashi) Numerical modeling of water and radionuclides (Gusyev)

Institute of Environmental Radioactivity (IER) regularly holds the IER seminar in which the faculty members report on their research results, with the aim of facilitating their research activities and promoting communication.

In the 1st IER seminar of this fiscal year that was held on June 26, 2023, two presentations were given by Project Lecturer, Yasunori IGARASHI, and Project Associate Professor, Maksym GUSYEV, to 26 participating researchers and students.

Project Lecturer Igarashi presented a new method of detecting wildfires in Chornobyl and his research on clarifying the concentration formation of ⁹⁰Sr and ¹³⁷Cs in rivers based on the dynamics of other ions.

Project Associate Professor Gusyev presented the recent numerical modeling results of the Kakhovka Dam break with the drainage of the Kakhovka reservoir, which was utilized to refill the cooling pond of the Zaporizhzhia Nuclear Power Plant (NPP), and downstream flood inundation depth in Ukraine. He also demonstrated numerical modeling results of the cooling pond drainage in the Chornobyl NPP explaining the concentration changes of ⁹⁰Sr and ¹³⁷Cs radionuclides in the cooling pond surface water and surrounding groundwater. The impact of the Dam break on surrounding groundwater and future agricultural activities was discussed emphasizing the importance of numerical modeling for scenario assessment.

After each presentation, various questions and opinions were exchanged among participants.