Study on retardation mechanism of 3H, 99Tc, 137Cs, 237Np and 241Am in compacted sodium bentonite

H. Sato; T. Ashida; Y. Kohara; M. Yui

Study on retardation mechanism of ³H, ⁹⁹Tc, ¹³⁷Cs, ²³⁷Np and ²⁴¹Am in compacted sodium bentonite

H. Sato, T. Ashida, Y. Kohara, M. Yui

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

Experiments were carried out in the density range of 0.4-2.0(x 10³ kg/m³). Bentonite in the cell was prepared to be saturated with distilled water. The measured apparent diffusion coefficient decreases with increasing dry density of bentonite. That the apparent diffusion coefficient of ³H decreased as a function of dry density of bentonite appears to be the effect of the change of porous structure with dry density of bentonite. ⁹⁹Tc may be retarded by anion-exclusion because dominant diffusion species of ⁹⁹Tc is pertechnetate ion under atmospheric condition. Retardation for ¹³⁷Cs may be caused by ion-exchange on bentonite.

Original language	English
Title of host publication	Materials Research Society Symposium Proceedings
Publisher	Publ by Materials Research Society
Pages	403-408
Number of pages	6
ISBN (Print)	1558991891
Publication status	Published - Jan 1 1993
Externally published	Yes
Event	Proceedings of the 16th International Symposium on the Scientific Basis for Nuclear Waste Management - Boston, MA, USA Duration: Nov 30 1992 → Dec 4 1992

Publication series

Name	Materials Research Society Symposium Proceedings
Volume	294
ISSN (Print)	0272-9172

Other

Other	Proceedings of the 16th International Symposium on the Scientific Basis for Nuclear Waste Management
City	Boston, MA, USA
Period	11/30/92 → 12/4/92

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

Cite this

Study on retardation mechanism of ³H, ⁹⁹Tc, ¹³⁷Cs, ²³⁷Np and ²⁴¹Am in compacted sodium bentonite. / Sato, H.; Ashida, T.; Kohara, Y. et al.

Materials Research Society Symposium Proceedings. Publ by Materials Research Society, 1993. p. 403-408 (Materials Research Society Symposium Proceedings; Vol. 294).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Sato, H, Ashida, T, Kohara, Y & Yui, M 1993, Study on retardation mechanism of ³H, ⁹⁹Tc, ¹³⁷Cs, ²³⁷Np and ²⁴¹Am in compacted sodium bentonite. in Materials Research Society Symposium Proceedings. Materials Research Society Symposium Proceedings, vol. 294, Publ by Materials Research Society, pp. 403-408, Proceedings of the 16th International Symposium on the Scientific Basis for Nuclear Waste Management, Boston, MA, USA, 11/30/92.

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AB - Experiments were carried out in the density range of 0.4-2.0(x 103 kg/m3). Bentonite in the cell was prepared to be saturated with distilled water. The measured apparent diffusion coefficient decreases with increasing dry density of bentonite. That the apparent diffusion coefficient of 3H decreased as a function of dry density of bentonite appears to be the effect of the change of porous structure with dry density of bentonite. 99Tc may be retarded by anion-exclusion because dominant diffusion species of 99Tc is pertechnetate ion under atmospheric condition. Retardation for 137Cs may be caused by ion-exchange on bentonite.

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