Hostname: page-component-6bf8c574d5-956mj Total loading time: 0 Render date: 2025-02-20T14:54:45.940Z Has data issue: false hasContentIssue false
  • English
  • Français

Study on Retardation Mechanism of 3H, 99Tc, 137Cs, 237Np and 241AM in Compacted Sodium Bentonite

Published online by Cambridge University Press:  01 January 1992

H. Sato ,
T. Ashida ,
Y. Kohara  and
M. Yui
H. Sato
Affiliation:
Power Reactor and Nuclear Fuel Development Corporation, Tokai-mura, Ibaraki-ken, 319-11, JAPAN
T. Ashida
Affiliation:
Power Reactor and Nuclear Fuel Development Corporation, Tokai-mura, Ibaraki-ken, 319-11, JAPAN
Y. Kohara
Affiliation:
Power Reactor and Nuclear Fuel Development Corporation, Tokai-mura, Ibaraki-ken, 319-11, JAPAN
M. Yui
Affiliation:
Power Reactor and Nuclear Fuel Development Corporation, Tokai-mura, Ibaraki-ken, 319-11, JAPAN
Get access

Abstract

The apparent diffusion coefficients were measured at room temperature (about 23°C) under atmospheric condition by the one-dimensional non-steady state diffusion method for 3H, 99Tc, 137Cs, 237Np and 241Am in compacted sodium-bentonite saturated with water. Sodium-bentonite, which is commercially available as KunigelVl®, was used in this study. Experiments were carried out in the density range of 0.4–2.0 (×103kg/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 specie of 99Tc is pertechnetate ion under atmospheric condition. Retardation for 137Cs may be caused by ion-exchange on bentonite. The sorption, anion-exclusion and molecular filtration are considered as a retardation mechanism for 237Np and 241Am because those dominant species are negatively charged and of large ionic size.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 294: Symposium V – Scientific Basis for Nuclear Waste Management XVI , 1992 , 403
Copyright
Copyright © Materials Research Society 1993

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

[1] Umeki, H., Ishiguro, K., Takase, H., Yui, M., Sasaki, N., and Masuda, S., in Proceedings of HIGH LEVEL RADIOACTIVE WASTE MANAGEMENT, 2, 1715–1733(1991).Google Scholar
[2] Muurinen, A., Rantanen, J., and Penttila-Hiltuienin, P. Scientific Basis for Nuclear Waste Management IX,edited by Werme, L.O. (Mater.Res.Soc.Symp. 50, Stockholm, 1985)pp.617-624;Google Scholar
[3] Wanner, H., Scientific Basis for Nuclear Waste Management IX,edited by Werme, L.O. (Mater.Res.Soc.Symp. 50, Stockholm, 1985) pp.509-516.Google Scholar
[4] Christiansen, B. and Torstenfelt, B., Radiochimica Acta 44/45, 219–223(1988).Google Scholar
[5] Eriksen, T., Jacobsson, A., and Pusch, R., SKBF/FTSTR 81-06(1981).Google Scholar
[6] Nowak, E.J., in Scientific Basis for Nuclear Waste Management VI, edited by Brookings, D.G., (Mater.Res.Soc.Symp. 15, Boston, 1983), pp.735-744.Google Scholar
[7] Torstenfelt, B., Andersson, K., Kipatsi, H., Allard, B., and Olofsson, U., Scientific Basis for Nuclear Waste Management V edited by Topp, S.V. (Mater.Res.Soc.Symp. 6, Boston, 1982), pp.295-302;Google Scholar
[8] pp.659-668.Google Scholar
[9] Torstenfelt, B. and Allard, B., SKBF/KBS TR 86-14(1986).Google Scholar
[10] Murrinen, A., Rantanen, J., and Ovaskainen, R., in Scientific Basis for Nuclear Waste Management VIII, edited by Jantzen, C.J., Stone, J.A. and Ewing, H.U. (Mater.Res.Soc. Symp. 44, Boston, 1985), pp. 883-890.Google Scholar
[11] Murriin, A., Penttila-Hiltunen, P., and Uusheimo, K., in Scientific Basis for Nuclear Waste Management XII, edited by Lutze, W. and Ewing, R.C. (Mater.Res. Soc. Symp. 127, Boston, 1989), pp.743-748.Google Scholar
[12] Tors-tenfelt, B., Kipatsi, H.,and Allard, B., Soil. Sci. 139(6), 512–516(1985).Google Scholar
[13] Crank, J., The Mathematics of Diffusion, 2nd ed.(Oxford Univ. Press, London, 1975).Google Scholar
[14] ‘Kagakukogaku Binran’(Handbook of Chemical Engineering), 4th ed. (Kagakukogaku Kyokai, Maruzen, Tokyo, 1982)(in Japanese).Google Scholar
[15] Brandberg, F. and Skagius, K., Technical report SKB 91-16 (1991).Google Scholar
[16] Mckinley, I.G. and Hadermann, J., NAGRA Technical report NTB 84-40(1984).Google Scholar
[17]PNC Technical report, PNC TN1410 91-079(1991)(in Japanese).Google Scholar
[18] Parkurst, D.L., Thorstenson, D.C. and Plummer, L.N., PHREEQE-A Computer Program for Geochemical Calculations,U.S. GEOLOGICAL SURVEY,Water-Resources Investigations 80–96(1980).Google Scholar
[19] Ticknor, K.V.and Ruegger, B., A Guide to The NEA's Sorption Data Base, version 2.0,OECD/NEA(1989).Google Scholar
[20] Sato, H., Ashida, T., Kohara, Y., Yui, M., and Sasaki, N., Journal of Nuclear Science and Technology, 29, (9), 873–882(1992).Google Scholar