Isotopic Evidence for Microbial Activity in Crystalline Bedrock Fractures – a Case Study from Olkiluoto, SW Finland

Elina Kyllikki Sahlstedt, Natural Resources Institute Finland, Luke, Bioeconomy and Environment Unit, Helsinki, Finland, Juha Karhu, Univ Helsinki, Helsinki, Finland and Petteri Pitkänen, Posiva Oy, Eurajoki, Finland