1. Institut de Radioprotection et de Sûreté Nucléaire (IRSN), Fontenay-Aux-Roses 92260, France
2. Rivne Nuclear Power Plant (ENERGOATOM), Varash, Rivne Region 34400, Ukraine
3. State Specialized Enterprise Ecocentre (SSE ECOCENTRE), Chornobyl, Kiev region 07270, Ukraine
4. Ukrainian Hydrometeorological Institute (UHMI), Kyiv 03028, Ukraine
5. Institute of Radioecology and Radiation Protection, Leibniz Universität Hannover, Hannover 30419, Germany
6. National Radiation Protection Institute (SÚRO), Prague 4 140 00, Czech Republic
7. StudieCentrum voor Kernenergie - Centre d’Etude de l’Energie Nucléaire (SCK-CEN), Mol 2400, Belgium
8. Department of Radioecology, Center for Ecological-Noosphere Studies (NAS RA), Yerevan 0025, Armenia
9. Deutscher Wetterdienst (DWD), Offenbach 63067, Germany
10. Institute of Nuclear and Radiological Sciences & Technology, Energy & Safety, National Centre for Scientific Research “Demokritos”, Athens 15310, Greece
11. Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT), Unidad de Radioactividad Ambiental y Vigilancia Radiológica, Madrid 28040, Spain
12. Nuclear Physics and Elementary Particle Physics Division, Physics Department, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
13. Central Laboratory for Radiological Protection (CLRP), Warsaw, PL 03-194, Poland
14. Radiation and Nuclear Safety Authority (STUK), PL 14, Helsinki 00881, Finland
15. Swedish Defence Research Agency (FOI), 164 90 Stockholm, Sweden
16. Department of Radiation Protection and Technical Quality Assurance, Austrian Agency for Health and Food Safety (AGES), Vienna 1220, Austria
17. The Henryk Nievodniczanski Institute of Nuclear Physics (IFJ), Polish Academy of Sciences, Kraków 31-342,Poland
18. National Institute of Public Health and the Environment (RIVM), P.O. Box 1, Bilthoven, BA NL-3720, The Netherlands
19. Department of Radiobiology and Radiohygiene (NNK SSFO), National Public Health Center, Budapest H-1221, Hungary
20. Emergency Preparedness and Response, Norwegian Radiation and Nuclear Safety Authority (DSA), Svanvik NO-9925, Norway
21. Department of Radiation and Environmental Protection, Vinča Institute of Nuclear Sciences, Belgrade 11351, Serbia
22. Department of Nuclear Physics and Biophysics, Comenius University, Bratislava 842 48, Slovakia
23. Centro Regionale Radioprotezione, Agenzia Regionale per la Protezione dell’Ambiente della Lombardia (ARPA Lombardia), 20124 Milan, Italy
24. National Center for Hydrometeorology, Radioactive Contamination Control, and Environmental Monitoring (BELHYDROMET), Minsk, 220114, Belarus
25. National Environmental Protection Agency (NEPA), National Reference Laboratory, Bucharest 060031, Romania
26. Federal Office of Public Health (FOPH - OFSP), Environmental Radioactivity Section, Liebefeld CH-3097, Switzerland
27. Physikalisch-Technische Bundesanstalt (PTB), Braunschweig 38116, Germany
28. Institut “Jozef Stefan” (IJS), Ljubljana SI-100, Slovenia