Sorption and diffusion of radionuclides in rock matrix and natural fracture surfaces studied by autoradiography

Conference · Wed Jan 01 04:00:00 EST 1986 · Mater. Res. Soc. Symp. Proc.; (United States)

OSTI ID:5483163

Muuronen, S; Kaemaeraeinen, E L; Jaakkola, T; Pinnioja, S; Lindberg, A

A method based on autoradiography was developed to determine the sorption and diffusion of cesium, strontium, cobalt, nickel, iodine and americium into rock matrix. Samples chosen for this study were filled and unfilled natural fracture surfaces and drill cores having a central drilled hole (drill core cups). Rock types were mica gneiss, tonalite and rapakivi granite, which were selected to represent the common rocks and minerals in Finnish bedrock. Distribution coefficients (K/sub a/-values) of cesium and strontium determined for fissure surfaces and drill core cups were of the same order of magnitude. After three months contact time the greatest penetration depth for cesium was 2.5 mm, for a natural fissure surface sample of rapakivi granite. For strontium the penetration depths of 11 mm in three months and 35 mm in twelve months were found for filled natural fissure surface samples of rapakivi granite. The range of D/sub a/-values was 1.5 x 10/sup -15/ - 3.2 x 10/sup -14/ m/sup 2//s and 1.4 x 10/sup -14/ - 2.1 x 10/sup -13/ m/sup 2//s for cesium and strontium, resp. For cobalt the D/sub a/-values of 5 x 10/sup -16/ m/sup 2//s in tonalite was obtained. In six months the penetration depths of nickel, iodine and americium were too low (<0.5 mm) to allow calculation of D/sub a/.

• Research Organization: Univ. of Helsinki, Finland
• OSTI ID: 5483163
• Report Number(s): CONF-850995-
• Conference Information: Journal Name: Mater. Res. Soc. Symp. Proc.; (United States) Journal Volume: 50
• Country of Publication: United States
• Language: English

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54 ENVIRONMENTAL SCIENCES
ACTINIDES
ALKALI METALS
ALKALINE EARTH METALS
AMERICIUM
AUTORADIOGRAPHY
BOREHOLES
CAVITIES
CESIUM
COBALT
DIFFUSION
DISTRIBUTION FUNCTIONS
ELEMENTS
ENVIRONMENTAL TRANSPORT
FUNCTIONS
GNEISSES
GRANITES
HALOGENS
IGNEOUS ROCKS
IODINE
MANAGEMENT
MASS TRANSFER
METALS
METAMORPHIC ROCKS
NICKEL
NONMETALS
PLUTONIC ROCKS
RADIOACTIVE WASTE DISPOSAL
RADIONUCLIDE MIGRATION
ROCKS
SORPTION
STRONTIUM
TRANSITION ELEMENTS
TRANSPLUTONIUM ELEMENTS
TRANSURANIUM ELEMENTS
UNDERGROUND DISPOSAL
WASTE DISPOSAL
WASTE MANAGEMENT