International intercomparisons of integrating radon/thoron detectors with the NIRS radon/thoron chambers
Authors: Janik, M.; Tokonami, S.; Kranrod, C.; Sorimachi, A.; Ishikawa, T.; Hassan, N. M.
Source: Radiation Protection Dosimetry, Volume 141, Number 4, November 2010 , pp. 436-439(4)
Publisher: Oxford University Press
Abstract:Intercomparisons of radon/thoron detectors play an important role not only for domestic radon/thoron survey but also for international or interregional discussion about radon/thoron mapping in dwellings as well as that in the soil. For these purposes, it is necessary to improve and standardise technical methods of measurement and to verify quality assurance by intercomparisons between laboratories. Therefore, the first thoron international intercomparison was provided at the NIRS (National Institute of Radiological Sciences, Japan) thoron chamber with a 150 dm3 inner volume. In addition, a second intercomparison of radon detectors was conducted at NIRS with a 24.4 m3 inner volume walk-in radon chamber. Only etched-track detectors were used during thoron intercomparison as well as three types for the radon intercomparison: etched-track, charcoal and electret. In general, 45 results for thoron experiment do not differ more than 20 from the reference value of thoron concentration and 69 for radon.
Document Type: Research Article
Publication date: November 2010
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