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Microtomography-bas...
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Iraola, Aitor
(författare)
Microtomography-based Inter-Granular Network for the simulation of radionuclide diffusion and sorption in a granitic rock
- Artikel/kapitelEngelska2017
Förlag, utgivningsår, omfång ...
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Elsevier BV,2017
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printrdacarrier
Nummerbeteckningar
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LIBRIS-ID:oai:DiVA.org:kth-330368
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https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-330368URI
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https://doi.org/10.1016/j.jconhyd.2017.10.003DOI
Kompletterande språkuppgifter
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Språk:engelska
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Sammanfattning på:engelska
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Klassifikation
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Ämneskategori:ref swepub-contenttype
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Ämneskategori:art swepub-publicationtype
Anmärkningar
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QC 20230630
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Field investigation studies, conducted in the context of safety analyses of deep geological repositories for nuclear waste, have pointed out that in fractured crystalline rocks sorbing radionuclides can diffuse surprisingly long distances deep into the intact rock matrix; i.e. much longer distances than those predicted by reactive transport models based on a homogeneous description of the properties of the rock matrix. Here, we focus on cesium diffusion and use detailed micro characterisation data, based on micro computed tomography, along with a grain-scale Inter-Granular Network model, to offer a plausible explanation for the anomalously long cesium penetration profiles observed in these in-situ experiments. The sparse distribution of chemically reactive grains (i.e. grains belonging to sorbing mineral phases) is shown to have a strong control on the diffusive patterns of sorbing radionuclides. The computed penetration profiles of cesium agree well with an analytical model based on two parallel diffusive pathways. This agreement, along with visual inspection of the spatial distribution of cesium concentration, indicates that for sorbing radionuclides the medium indeed behaves as a composite system, with most of the mass being retained close to the injection boundary and a non-negligible part diffusing faster along preferential diffusive pathways.
Ämnesord och genrebeteckningar
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Grain-scale model
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Diffusion experiment
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Anomalously long cesium penetration
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Heterogeneity of sorption sites
Biuppslag (personer, institutioner, konferenser, titlar ...)
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Trinchero, Paolo
(författare)
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Voutilainen, Mikko
(författare)
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Gylling, Björn
(författare)
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Selroos, Jan-OlofSwedish Nuclear Fuel and Waste Management Company, Box 250, Stockholm 101 24, Sweden(Swepub:kth)u11io84a
(författare)
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Molinero, Jorge
(författare)
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Svensson, Urban
(författare)
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Bosbach, Dirk
(författare)
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Deissmann, Guido
(författare)
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Swedish Nuclear Fuel and Waste Management Company, Box 250, Stockholm 101 24, Sweden
(creator_code:org_t)
Sammanhörande titlar
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Ingår i:Journal of Contaminant Hydrology: Elsevier BV207, s. 8-160169-77221873-6009
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