1. Bundesanstalt für Materialforschung und –prüfung, (BAM) Richard‐Willstätter‐Straße 11, 12489 Berlin Germany
2. IsoAnalysis UG Berlin 10829 Germany
3. University of Modena and Reggio Emilia Modena 41125 Italy
4. Lamont‐Doherty Earth Observatory of Columbia University Palisades, New York 10964 USA
5. GFZ German Research Centre for Geosciences Telegrafenberg, 14473 Potsdam Germany
6. Freie Universität Berlin Malteserstraße 74‐100, 12249 Berlin Germany
7. Czech Geological Survey Klarov 3, CZ‐11821 Prague 1 Czech Republic
8. Montanuniversität Leoben Franz‐Josef‐Straße 18, 8700 Leoben Austria
9. University of Bologna Via degli Ariani 1, 48121 Ravenna Italy
10. Faculty of Geosciences and Marum – Center for Marine Environmental Sciences University of Bremen Leobener Strasse 8, 28359 Bremen Germany
11. National Institute of Standards and Technology 100 Bureau Drive, Gaithersburg 20899 MD USA
12. Physikalisch‐Technische Bundesanstalt Bundesallee 100, 38116 Braunschweig Germany
13. United States Geological Survey One Denver Federal Center Denver 80225 CO USA
14. Georg‐August‐Universität Göttingen Geoscience Center Göttingen 37077 Germany
15. Jožef Stefan Institute Jamova 39, 1000 Ljubljana Slovenia