Impact of Wind Speed on Response of Diffusion-Type Radon-Thoron Detectors to Thoron

Bibliographic Data

ID15480491
AuthorsYasutaka Omori (0000-0003-3629-8761, Fukushima Medical University, corresponding author), Yuki Tamakuma (0000-0003-4054-2501, Hirosaki University), Eka Djatnika Nugraha (0000-0002-6989-2313, Hirosaki University), Takahito Suzuki (0000-0002-8752-0695, Fuji Electric (Japan)), Miki Arian Saputra (0000-0002-3812-8478, Hirosaki University), Masahiro Hosoda (0000-0001-5187-5446, Hirosaki University), Shinji Tokonami (0000-0002-6617-7402, Hirosaki University)
Year2020
Volume17
Issue9
Pages3178-3178
Publication date2020-05-02
Peer ReviewedYes
Open AccessYes
TypeARTICLE
VenueInternational Journal of Environmental Research and Public Health (JOURNAL)
Journal identifiersISSN: 1661-7827 • E-ISSN: 1660-4601
PublisherMultidisciplinary Digital Publishing Institute (PUBLISHER • CH)
DOI10.3390/ijerph17093178
PMID32370255
OpenAlexW3023828810
LanguageEN
Citations received2
References cited2

Air exchange through a porous medium depends partly on a pressure gradient induced in it, i.e., air-flow conditions of the outer air. Consequently, response of diffusion-type detectors to radon and thoron may vary with air-flow conditions surrounding the detectors. This effect may be significant for thoron measurement because thoron has a shorter half-life than radon. The present study examined response of diffusion-type detectors (RADUETs and one AlphaGUARD) to thoron with respect to wind speed using a thoron calibration chamber. Response of RADUETs to thoron increased with wind speed. Response of the AlphaGUARD increased with wind speed, but it became constant at a high wind speed. Different response trends to thoron between the RADUETs and the AlphaGUARD could be qualitatively explained by flow states induced by the pressure gradient in the filter or the sponge of these detectors. For RADUETs, laminar (Darcy) flow was induced in the sponge in the examined wind speed range, which meant that thoron entry into the detector increased with wind speed. For the AlphaGUARD, laminar flow was induced in the filter in the low wind speed range, whereas flow was changed to turbulent (non-Darcy) flow at a high wind speed for which thoron entry into the detector did not depend on wind speed

Airflow · Atmospheric sciences · Density of air · Detector · Diffusion · Laminar flow · Mechanics · Meteorology · Nuclear physics · Optics · Physics · Pressure gradient · Radon · Wind direction · Wind speed · Environmental Science · Geophysical Methods and Applications · Radiation Dose and Imaging · Radioactivity and Radon Measurements · Geology

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