Professor Yoshio Takahashi received the Commendation for Science and Technology by the Minister of Education, Culture, Sports, Science and Technology

Professor Yoshio Takahashi of the Department of Earth and Planetary Science has been awarded The Commendation for Science and Technology by the Minister of Education, Culture, Sports, Science and Technology (Research Category) for his research on the “Creation and Development of Molecular Geochemistry.”

Approximately 30 years ago, geochemical research largely relied on discussions of correlations among elemental concentrations and isotope ratios. Professor Takahashi introduced chemical speciation analysis—particularly synchrotron radiation–based XAFS (X-ray Absorption Fine Structure) techniques—into this field and established “molecular geochemistry” as a new discipline.

His research has covered a wide range of topics, including the environmental behavior of hazardous elements; chemical processes of atmospheric aerosols and their environmental impacts; the mechanisms of stable isotope fractionation of heavy elements and their application to paleoenvironmental studies; the environmental behavior of radionuclides; the geochemistry of rare earth elements and its application to resource geoscience; and aqueous alteration processes in C-type asteroids.

These works have significantly contributed to reducing the behavior of elements in natural systems to fundamental chemical processes, thereby advancing the study of elemental cycles grounded in physicochemical theory.

He has also made major contributions to technological development, including the development of scanning transmission X-ray microscopy (STXM), as well as promoting the application of superconducting transition-edge sensors (TES) and high energy-resolution fluorescence-detected XANES methods to environmental geochemistry.

Furthermore, through these research activities, he has mentored and produced more than 20 PhD graduates, playing a vital role in both the advancement of geochemistry, environmental chemistry, and radiochemistry, and in the training of future researchers.

Professor Takahashi modestly remarks, “I simply like thinking about the speciation of elements in nature,” a statement that reflects his steady expansion into new elemental domains and suggests that he will continue to broaden the horizons of his research. We look forward to his continued success.

（Responsibility: Associate Professor Takaaki Itai, Department of Earth and Planetary Environmental Science）

School of Science, UTokyo：https://www.s.u-tokyo.ac.jp/en/info/11129/