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List of Presentations
Satoshi Utsunomiya Last modified date：2023.10.03

Associate Professor / Inorganic Reaction Chemistry / Department of Chemistry / Faculty of Sciences


Presentations
1. Satoshi Utsunomiya, Challenging Radionuclides in Environment at the Atomic Scale: Issues in Waste Disposal and Fukushima, Goldschmidt Conference, 2016.06, [URL], Radionuclides are beneficial in many instances such as power generation, industrial, medical, and geochronological applications. Conversely, some fission products and actinides produced in nuclear reactors are radiotoxic and have long half-lives. These radionuclides need to be isolated and safely stored for geological periods; however, there have been instances where the release of these radionuclides has caused serious environmental issues. In such instances, the release of these radionuclides is governed by their interaction with inorganic, organic, and biological substances at the molecular scale in the Earth’s surface and sub-surface. Naturally-occurring nano-particles and microorganisms also play an important role in facilitating or retarding the migration of low-solubility radionuclides. The migration processes at the nano- and atomic-scales have been illustrated by atomic-resolution transmission electron microscopy (TEM). TEM is a powerful technique that enables us to investigate the structural and chemical properties of these particles at scales ranging from micron to sub-angstrom. This talk will address some of the observable microscopic phenomena that can impact the migration of radionuclides in surface and subsurface environments; physical and chemical alteration of nuclear waste and UO2+x, colloid-facilitated transport, microbial nanocrystallization of rare earth elements that are used as surrogate of trivalent actinides, the interaction between nanoparticles and microorganisms, and most recently contamination at Fukushima. At the present, 134Cs and 137Cs are important dose contributors, and their radioactivity will remain in soils, mainly fixed in the form of submicron-sized clay minerals. Some of the particles associated with Cs are transported while surface soils are run off. On the other hand, at the initial stage of Cs release from Fukushima Daiichi Nuclear Power Plant, low-solubility Cs-rich micro-particles, which contain up to ~36 wt% of Cs as Cs2O, are responsible for ~90% of the radioactivity (rather than soluble forms of Cs such as CsOH). The interior of these particles exhibit evidence of various nanoscale processes in the molten core-concrete interaction (MCCI) that occurred subsequent to melt down in the primary containment vessel. Still, these particles play an important role in the dispersion of low-volatile radionuclides into the surrounding environment. The latter half of the talk will highlight various microscopic but critical phenomena in Fukushima as unveiled by state-of-the-art TEM investigations.
2. Utsunomiya S, Nano- and molecular-scale phenomena in the subsurface environment with nanoparticles and microorganisms; implication to nuclear waste management, Specific behavior of anthropogenic radionuclides at solid solution interface: implication for migration and remediation, 2013.11.
3. Utsunomiya S, Shiotsu H, Jiang M, Ohnuki T, Nanoparticle formation of lanthanides on Saccharomyces cerevisiae, February 18-19, 2013, Japan-UK workshop, The Studio, Birmingham, UK., Japan-UK workshop, The Studio, 2013.02.
4. Ohnuki T, Kozai N, Sakamoto F, Yamasaki S, Utsunomiya S, Nishiguchi N, Suzuki Y, Accumulation of lanthanides and actinides by microorganisms – present status, Japan-UK workshop, The Studio, 2013.02.
5. Utsunomiya S, Cesium contamination in Fukushima soils and exploration of effective decontaminant, International workshop on post-Fukushima challenges in nuclear safety and environmental contamination, 2012.06.
6. Shiotsu H, Jiang M, Nakamatsu Y, Ohnuki T, Utsunomiya S, Characteristic　of the long-term accumulation of lanthanides on Saccharomyces cerevisiae, Characteristic　of the long-term accumulation of lanthanides on Saccharomyces cerevisiae, 2012.06.
7. Utsunomiya S, Microscopic View of Colloids Associated with Radionuclides in the Environments, Migration 2011, 13th International Conference on the Chemistry and Migration Behaviour of Actinides and Fission Products in the Geosphere, September 18 - 23, 2011, Beijing, China. Invited , 2011.09.
8. Iwata H, Sakamaki K, Yasuda K, Ohnuki T, Utsunomiya S, Fate of Plutonium Derived From the Atomic Bomb Detonated at Nagasaki, Japan, Migration 2011, 13th International Conference on the Chemistry and Migration Behaviour of Actinides and Fission Products in the Geosphere, 2011.09.
9. Iwata H, Sakamaki K, Yasuda K, Ohnuki T, Utsunomiya S, Fate of Plutonium Derived From the Atomic Bomb Detonated at Nagasaki, Japan, Migration 2011, 13th International Conference on the Chemistry and Migration Behaviour of Actinides and Fission Products in the Geosphere, 2011.09.
10. Sakamaki K, Iwata H, Kamiishi E, Utsunomiya S, Alteration of Bentonite-Iron System under the Hyper Alkaline Condition , Migration 2011, 13th International Conference on the Chemistry and Migration Behaviour of Actinides and Fission Products in the Geosphere, 2011.09.
11. Kamiishi E, Utsunomiya S, Mechanism of Selenite Sequestration by Low-Soluble Phosphate Minerals , Migration 2011, 13th International Conference on the Chemistry and Migration Behaviour of Actinides and Fission Products in the Geosphere , 2011.09.
12. Sakamaki K, Iwata H, Kamiishi E, Utsunomiya S, Alteration of Bentonite-Iron System under the Hyper Alkaline Condition , Migration 2011, 13th International Conference on the Chemistry and Migration Behaviour of Actinides and Fission Products in the Geosphere, 2011.09.
13. Kamiishi E, Utsunomiya S, Mechanism of Selenite Sequestration by Low-Soluble Phosphate Minerals , International Conference on the Chemistry and Migration Behaviour of Actinides and Fission Products in the Geosphere, 2011.09.
14. Jiang M, Ohnuki T, Tanaka K, Kozai N, Kamiishi E, Utsunomiya S, Post-Adsorption Process of REE (Sm, Yb) Phosphate Nano-Mineralization by Microorganism, International Conference on the Chemistry and Migration Behaviour of Actinides and Fission Products in the Geosphere, 2011.09.
15. Kaneko M, Nakamatsu Y, Xie Z., Utsunomiya S, Physical and Chemical State of Fe-phases in Chinese Dust Storm, Goldschmidt Conference, 2011.08.
16. Nakamatsu Y, Kaneko M, Kogawa M, Utsunomiya S, Chemical state of Fe on fine and ultrafine particles in the urban atmosphere in Japan, Workshop Study on Radionuclides Migration for Environmental Safety Assessment, SSRF, 2011.09.
17. Utsunomiya S, Importance of XAFS study in Environmental Chemistry, SSRF, 2011.09.
18. Utsunomiya S, Nanoscale Occurrence of Radionuclides in the Environments Revealed by Scanning Transmission Electron Microscopy (STEM), The 2010 International Chemical Congress of Pacific Basin Societies, 2010.12.
19. Nishita C, Kogawa M, S.Utsunomiya, Chemical State of Fe in Fine and Ultrafine Particles in the Urban Atmosphere, Goldschmidt conference, 2010.06.
20. Jiang M, Ohnuki T, Kamiishi E, Tanaka K, Kozai N, Suzuki Y, S.Utsunomiya, Nanoscale Process in the Alteration of Bentonite-Iron System Under the Hyper Alkarine Conditions, Goldschmidt conference, 2010.06.
21. Kogawa M, Watson B, Ewing R, Utsunomiya S, Pb-Incorporation into Synthetic Pb-Doped Ziricon, Goldschmidt conference, 2010.06.
22. Kamisihi E, Utsunomiya S, Mechanism of Selenite Sequestration byLow-Soluble Phosphate Minerals, Goldschmidt conference, 2010.06.
23. Jiang M, Ohnuki T, Kamiishi E, Tanaka K, Kozai N, Suzuki Y, Utsunomiya S, Biological Nano-Mineralization of Yb phosphate by Saccharomyces cerevisiae, Goldschmidt conference, 2010.06.


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