1. Institute of Materials Technology, Building Physics and Construction Ecology, Faculty of Civil Engineering, Vienna University of Technology, 1040 Vienna, Austria
2. Institute of Chemical Technologies and Analytics, Vienna Institute of Technology, 1060 Wien, Austria
3. Opigeo SRL, 36040 Grisignano di Zocco, Italy
4. Department of Geoscience and CIRCe Center, University of Padua, 35131 Padova, Italy
5. Institute of Applied Physics, Vienna Institute of Technology, 1040 Wien, Austria
6. NJORD Centre, Department of Physics, University of Oslo, P.O. Box 1048, Oslo 0316, Norway