1. Environmental Radioactivity Lab, Institute of Nuclear & Radiological Sciences & Technology, Energy & Safety, NCSR “Demokritos”, Ag. Paraskevi, Athens, Greece
2. Institute of Nuclear and Particle Physics, NCSR “Demokritos”, Atiki, Greece
3. Scobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, Moscow, Russia
4. Department of Atmospheric and Climate Research (ATMOS), NILU - Norwegian Institute for Air Research, Kjeller, Norway
5. Central Aerological Observatory, Moscow Region, Russia
6. Chemical Department, Lomonosov Moscow State University, Moscow, Russia