| ERA – EUROPEAN RADON ASSOCIATION |  |
| China University of Geosciences; School of Geophysics and Information Technology Beijing, CHINA Project under the agreement on scientific and technical cooperation between the Government of the Republic of Poland and the Government of the People’s Republic of China, (2017-2019) „Procedures for field measurements at radon/thoron prone areas used for assesment of radiological hazard for population” |  |
| University of Cantabria; Radon Group Santander, SPAIN |  |
| Comenius University; Faculty of Mathematics, Physics and Informatics Bratislava, SLOVAKIA |  |
| Jozef Stefan Institute, Centre for Radon Lubljana, SLOVENIA |  |
| Institute of Nuclear Sciences „VINČA” Belgrade, SERBIA |  |
| National Institute of Radiological Sciences (NIRS) Chiba, JAPAN |  |
| University College Dublin Dublin, IRELAND |  |
| University of Pannonia Veszprem, HUNGARY |  |
| radon v.o.s. Prague, CZECH REPUBLIC |  |
| National Radiation Protection Institute Prague, CZECH REPUBLIC |  |
| International Atomic Energy Agency (IAEA) Wien, AUSTRIA |  |
| National Atomic Agency (PAA) Warszawa, POLAND |  |
| Central Laboratory for Radiological Protection (CLOR) Warszawa, POLAND |  |
| Science and Technology University (AGH) Kraków, POLAND |  |
| Medical University of Bialystok, Department of Biophysics Białystok, POLAND |  |
| Central Mining Institute (GIG), Laboratory of Radiometry Katowice, POLAND |  |
| Wrocław University of Technology; Division of Geology and Minerals Water Wrocław, POLAND |  |
| Lublin University of Technology; Faculty of Environmental Engineering Lublin, POLAND |  |
| University of Lódź; Department of Meteorology and Climatology Łódź, POLAND |  |
| Tatra National Park Zakopane, POLAND |  |
