Professor Shinji Tokonami, Vice President of Hirosaki University, Director of the Radiation Emergency Medicine and Cooperation Promotion, and Vice Director of the Institute of Radiation Emergency Medicine (IREM), has once again been recognized among the world’s top 2% of scientists in both the single-year and career-long categories.
Professor Tokonami was included in the “Updated science-wide author databases of standardized citation indicators,” a comprehensive database of highly cited scientists developed by researchers at Stanford University (USA) and published through the Elsevier Data Repository on October 7, 2026.
The database is compiled using standardized information on citation counts, h-index, co-authorship-adjusted indices, citations to papers in different authorship positions, and composite indicators. Based on data from the Scopus bibliographic database, it provides rankings across 20 scientific fields and 174 subfields, covering scientists who have published at least five papers.

・Ranked among the World’s Top 2% of scientists (Single-Year Category, 2025)
Professor Shinji Tokonami, Institute of Radiation Emergency Medicine, Hirosaki University

・Ranked among the World’s Top 2% of scientists (Career-Long Category)
Professor Shinji Tokonami, Institute of Radiation Emergency Medicine, Hirosaki University

For the full list of Hirosaki University researchers included in the rankings, please visit:Hirosaki University – Researchers Ranked among the World’s Top 2% of Most Influential Scientists

Source: Elsevier Data Repository