1. Institute of Geological Sciences and Oeschger Centre for Climate Change Research University of Bern Baltzerstrasse 1+3 Bern 3012, Switzerland
2. Geo Explorers AG Wasserturmplatz 1 Liestal 4410, Switzerland
3. National Cooperative for the Disposal of Radioactive Waste (Nagra) Hardstrasse 73 Wettingen 5430 Switzerland