Rock–matrix diffusion and its implications for radionuclide migration

Autor:	M. H. Bradbury, D. A. Lever
Rok vydání:	1985
Předmět:	Radionuclide Hydrogeology Materials science 010504 meteorology & atmospheric sciences Flow (psychology) Mineralogy Radioactive waste 01 natural sciences Ion Geochemistry and Petrology Orders of magnitude (data) Nuclide Diffusion (business) 0105 earth and related environmental sciences
Zdroj:	Mineralogical Magazine. 49:245-254
ISSN:	1471-8022 0026-461X
DOI:	10.1180/minmag.1985.049.351.11
Popis:	Diffusion into the rock matrix is potentially an important retardation mechanism for nuclides leached from an underground radioactive waste repository in a fractured hard rock. A technique for measuring the intrinsic diffusion coefficient and rock capacity factor is briefly described. Simple solutions to migration model equations are used, together with diffusion results and typical hydrogeological parameters, to estimate the impact of matrix diffusion on radionuclide migration. It is shown that retardation factors in excess of 100 and reductions in the peak concentration by 3–4 orders of magnitude are possible for non-sorbed ions, which would otherwise be carried by the flow and not retarded at all.
Databáze:	OpenAIRE
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