Modelling in-situ matrix diffusion at Palmottu natural analogue study site in SW Finland

Kari Rasilainen, Juhani Suksi

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

    1 Citation (Scopus)


    Radioactive disequilibria, between U-238, U-234, and Th-230, in crystalline rock adjacent to a fracture, indicates mass transfer of U and Th between water in the fracture and the rock. The matrix diffusion theory was used to interpret the observed profiles of mobilized nuclides around the natural fracture. The interpretation of the profiles was based on the use of uranium series disequilibrium code, URSE, and migration code FTRANS. The model system was characterized using all available site-specific data, and the system evolution was outlined using the geology of the Palmottu site. The simulated concentration profiles, as a function of depth from the fracture surface, indicate that measured profiles can be modelled by matrix diffusion, assuming realistic initial and boundary conditions and diffusion times of 300,000 years.
    Original languageEnglish
    Title of host publicationScientific Basis for Nuclear Waste Management XVI
    Subtitle of host publicationSymposium V
    EditorsC.G. Interrante, R.T. Pabalan
    Place of PublicationPittsburgh
    PublisherMaterials Research Society
    ISBN (Print)978-1-558-99189-7
    Publication statusPublished - 1993
    MoE publication typeA4 Article in a conference publication
    EventMaterials Research Society Fall Meeting 1992 - Boston, United States
    Duration: 30 Nov 19924 Dec 1992

    Publication series

    SeriesMaterials Research Society Symposia Proceedings


    ConferenceMaterials Research Society Fall Meeting 1992
    Country/TerritoryUnited States


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