An international comparison of continuous monitors measuring radon activity concentration was performed to validate the traceability of the European radon calibration facilities. It was carried out by comparing the secondary standards used by these previous facilities, ranging from 100 Bq·m-3 to 300 Bq·m-3. Secondary standards were individually compared to a secondary reference device previously calibrated in a reference radon atmosphere traceable to a primary standard. The intercomparison was organized by the National Institute for Nuclear, Chemical, and Biological Protection (SUJCHBO) in the period from October 2019 to April 2020 within the European Metrology Program for Innovation and Research (EMPIR), JRP-Contract 16ENV10 MetroRADON. Eight European laboratories participated in this study. The results of the experiment are presented and discussed.

Central Laboratory for Radiological Protection PL03194 Warsaw Poland

Department of Geological Sciences Faculty of Science Masaryk University 60200 Brno Czech Republic

Federal Office for Radiation Protection 10318 Berlin Germany

Institut de Radioprotection et de Sûreté Nucléaire CEDEX 92262 Fontenay aux Roses France

Institut de Tècniques Energètiques Universitat Politècnica de Catalunya 08028 Barcelona Spain

Institutul National de Cercetare Dezvoltare Pentru Fizica si Inginerie Nucleara Horia Hulubei RO 077125 Magurele Romania

Nuclear Protection Department National Institute for Nuclear Chemical and Biological Protection 26231 Milin Czech Republic

Physikalisch Technischer Prüfdienst Bundesamt für Eich und Vermessungswesen 1160 Wien Austria

Radiation and Nuclear Safety Authority Environmental Radiation Surveillance 00811 Helsinki Finland

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