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

Higashihara, Tomohiro; Shibuya, Hiraku; Sato, Seichi; Kozaki, Tamotsu

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

Higashihara, Tomohiro; Shibuya, Hiraku; Sato, Seichi et al.

Engineering Geology, 2005, 81(3), 365-370

Permalink : https://hdl.handle.net/2115/8376

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アクセス権	open access
URI	https://hdl.handle.net/2115/8376
タイトル	Activation Energy for Diffusion of Helium in Water-Saturated, Compacted Na-Montmorillonite
著者	Higashihara, Tomohiro ; Shibuya, Hiraku ; Sato, Seichi ; Kozaki, Tamotsu
著者名 Higashihara, Tomohiro
著者名 Shibuya, Hiraku
e-Rad_Researcher 40117122 著者名 Sato, Seichi
e-Rad_Researcher 60234746 著者名 Kozaki, Tamotsu
言語	英語
キーワード	helium
	diffusion coefficient
	activation energy
	Na-montmorillonite
	transient diffusion method
	compacted bentonite
	water-saturation
	mass spectrometry
発行日	2005-11-14
出版者	Elsevier
収録物名	Engineering Geology
巻(号)	81(3)
ページ	365-370
抄録	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.
資源タイプ	学術雑誌論文
出版タイプ	Accepted Manuscript
PISSN	0013-7952
関連情報	URI http://www.sciencedirect.com/science/journal/00137952
関連情報 (isVersionOf)	出版社版DOI https://doi.org/10.1016/j.enggeo.2005.06.017