A simple technique for studying the dependence of radon and thoron exhalation rate from building materials on absolute humidity |
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Authors: | Nabil M Hassan Shinji Tokonami Masahiro Fukushi |
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Institution: | (1) Research Centre for Radiation Protection, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba 263-8555, Japan;(2) School of Radiological Sciences, Tokyo Metropolitan University, 7-2-10 Higashioku, Arakawa-ku, Tokyo 116-8551, Japan;(3) Department of Physics, University of Zagazig, Zagazig, 44519, Egypt |
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Abstract: | Indoor radon and thoron concentrations were dominated with their exhalation rate from building materials. Thus, the evaluation
of exhalation rate with highly precise is important. This paper presented a new technique to measure the dependence radon/thoron
exhalation rate, from building materials used in Japan, on absolute humidity. The measurement technique consisted of a solid
state alpha detector equipped a ventilation-type chamber and humidity control system in a flow through method. The exhalation
rate of dried samples (Indian red granite and Japanese gray granite) was measured at various absolute humidity levels in the
range of 1–20 g cm−3. It was found that exhalation rate increased exponential with increasing of absolute humidity for both samples. Furthermore,
the dependence of radon emanation coefficient on building material’s temperature was also studied using an accumulation chamber
equipped with scintillation cell alpha detector. The emanation coefficient of dry sample increased proportionally with increasing
the material’s temperature with a correlation factor of 0.88. |
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