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Activation Energy for Diffusion of Helium in Water-Saturated, Compacted Na-Montmorillonite

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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
transient diffusion method
compacted bentonite
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.
Type: article (author version)
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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