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Activation Energy for Diffusion of Helium in Water-Saturated, Compacted Na-Montmorillonite
Title: | Activation Energy for Diffusion of Helium in Water-Saturated, Compacted Na-Montmorillonite |
Authors: | Higashihara, Tomohiro Browse this author | Shibuya, Hiraku Browse this author | Sato, Seichi Browse this author →KAKEN DB | Kozaki, Tamotsu Browse this author →KAKEN DB |
Keywords: | helium | diffusion coefficient | activation energy | Na-montmorillonite | transient diffusion method | compacted bentonite | water-saturation | mass spectrometry |
Issue Date: | 14-Nov-2005 |
Publisher: | Elsevier |
Journal Title: | Engineering Geology |
Volume: | 81 |
Issue: | 3 |
Start Page: | 365 |
End Page: | 370 |
Publisher DOI: | 10.1016/j.enggeo.2005.06.017 |
Abstract: | It is important to clarify the migration behavior of hydrogen gas dissolved in water-saturated, compacted bentonite, which is a promising material for geologic disposal of high-level waste and TRU waste disposal. The diffusion coefficients of helium, which can be detected under extremely low background conditions, in water-saturated, compacted Na-montmorillonite were determined as a function of temperature by a transient diffusion method. The activation energies for diffusion of helium were then obtained. The activation energies were from 6.9 ± 4.8 to 19 ± 2.8 kJ mol^-1 and were regarded to be independent of dry density. The activation energies of helium in water-saturated Na-montmorillonite were roughly equal to those in bulk water, 14.9 kJ mol^-1, and in ice, from 11 to 13 kJ mol^-1. It is possible that helium diffuses not only in pore water but also in interlayer water. |
Relation: | http://www.sciencedirect.com/science/journal/00137952 |
Type: | article (author version) |
URI: | http://hdl.handle.net/2115/8376 |
Appears in Collections: | 工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 佐藤 正知
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