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A simple technique for studying the dependence of radon and thoron exhalation rate from building materials on absolute humidity
Faculty
Not Specified
Year:
2011
Type of Publication:
Article
Pages:
185-191
Authors:
Hassan, Nabil M, Fukushi, Masahiro, Tokonami, Shinji
DOI:
10.1007/s10967-010-0665-7
Journal:
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY SPRINGER
Volume:
287
Research Area:
Chemistry; Nuclear Science \& Technology
ISSN
ISI:000286333400026
Keywords :
Radon, Thoron, Exhalation rate, Emanation coefficient, Humidity, Temperature, Building materials, Japan
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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