Concentration distributions of natural decay chains 4n+2 and 4n+3 in crystalline rock intersected by a natural fracture were measured. Calcite coating on the same fracture surface was dated. Material properties of the rock matrix, and nuclide concentrations in groundwater were measured. The interpretation of the concentration distributions is based on the classical matrix diffusion concept. Although support was obtained, this calibration exercise does not yet validate the model. Besides initial and boundary conditions, matrix properties are uncertain due to the small amount of rock material. Experimental sorption data was not available, but its importance and the need for systematic studies was demonstrated.
|Series||Geologian tutkimuskeskus. Tutkimusraportti|
|Conference||4th International Conference on Chemistry and Migration Behaviour of Actinides and Fission Products in the Geosphere|
|Period||12/12/93 → 17/12/93|