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Home Publications Radiation HPA-RPD Series Reports ›  HPA-RPD-027 - Results of the 2003 NRPB Intercomparison of Passive Radon Detectors

HPA-RPD-027 - Results of the 2003 NRPB Intercomparison of Passive Radon Detectors

Strengthening the Frontline - Proposals for Future delivery


C B Howarth and J C H Miles

Publication date: 2007-06

ISBN: ISBN 978-0-85951-597-9



As in previous years, an intercomparison of passive radon detectors was held at the National Radiological Protection Board, now the Radiation Protection Division of the Health Protection Agency, in 2003. Forty-nine laboratories submitted 65 sets of passive detectors to this intercomparison. The exercise included three exposures to radon and its decay products at different equilibrium factors. After exposure, the detectors were returned to their originating laboratories for assessment. Participants reported the estimated exposure for each detector before they were notified of the exposures given to the detectors. The results obtained by participating laboratories were classified according to the spread of results from detectors exposed together and by the difference between the mean result of each group and the actual exposure given. Forty-two percent of the laboratories achieved the highest classification for accuracy, while 23% were in the lowest category. The proportion of laboratories achieving very good results is comparable to that seen in intercomparisons carried out prior to 2000. This is despite the fact that since 2000 these exercises have included a very low radon exposure, causing larger random errors in exposure assessment. This continued improvement therefore represents a significant achievement by the participating laboratories.


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Last reviewed: 30 July 2013