1. Two Kyt-projects: GeochemM: U-migration and retention in granitic rock U in Water-rock Interaction

2. Independents Both at a regional scale with samples of several sites from Finland and Sweden Two different approaches: –GeochemM: U-mineralogy, migration paths characterization and dating of U-minerals –U in WRI: U-isotopes (U-234, U-238) and activity ratios (U-234/U-238) distribution in groundwaters

3. Same conclusion Glacial melt water intrusion deep in the bedrock Other investigations with a third approach: I.D. Clarck et al. 2000. GROUND WATER 38 no. 5,735-742 - Melt water injected into the subsurface (700 m depth) during ablation of the Laurentide Ice Sheet at ca. 10 ka under conditions of high hydraulic gradient (modelled and supported by studies of Björnson (Nature 395, 771-774).

4. What so? Site investigation studies refer to the same event (oxygen isotope values) What is the fate of radionuclides (products, positon, migration rates, distances, and paths): –Need of mineralogical studies and characterization of possible migration paths

5. Future prospects Main report (TKK-series) with last findings and modelling approach Publications to referee journals: –U-mineralogy (chemistry) and migration –U-mineral dating and connection to glacial cycles –Modelling approaches (reactive models for radionuclide migration in granitic rocks)