INTRODUCTION: In the frame of the RadoNorm project, within work package 5.4, an intercomparison of radon and radon progeny measurements was organized in the Historic Silver Mine in Tarnowskie Gory (Poland). The aim of this intercomparison campaign was to compare the results of different electronic monitors for measurement of radon and radon progeny concentration under field conditions of an underground workplace over 3 days of measurements. METHODS: In total, nine laboratories from seven European countries participated in the intercomparison study contributing with sixteen continuous radon monitors, ten radon progeny continuous monitors, and one TLD-based integrating system for PAEC measurements. RESULTS: Despite the short duration of the field campaign, the comparison of radon activity concentration measurements showed strong consistency across most instruments, although notable deviations were observed with three instruments. Radon equivalent equilibrium concentration measurements also demonstrated good agreement, with only one outlier among ten instruments. Comparison of short term averages of EEC (PAEC) obtained from continuous monitors and integral TLD based Alpha probes showed good agreement. Greater variability was observed in the results for unattached radon progeny. DISCUSSION: This intercomparison also allowed of testing instrument's responses in extreme ambient conditions with high humidity and relatively low temperature that are at the edge of the instrument's operating conditions.

Centralne Laboratorium Ochrony Radiologicznej Warsaw Poland

Centro Nazionale per la Protezione dalle Radiazioni e Fisica Computazionale Istituto Superiore di Sanità Rome Italy

Departament de Física Universitat Autònoma de Barcelona Barcelona Spain

Direction de la recherche et de l'expertise en environnement Autorité de Sûreté Nucléaire et de Radioprotection Montrouge France

Direktoratet for strålevern og atomsikkerhet Østerås Norway

Główny Instytut Górnictwa Państwowy Instytut Badawczy Katowice Poland

Institute of Energy Technologies Universitat Politècnica de Catalunya Barcelona Spain

Österreichische Agentur für Gesundheit und Ernährungssicherheit Abteilung Radon und Radioökologie Linz Austria

Physics Department Universitat Politècnica de Catalunya Barcelona Spain

Statni ustav radiacni ochrany v v i Prague Czechia

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