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The Determination of Radon Exhalation Rates
Health Physics, 1983The exhalation of radon from porous materials like mining wastes and building materials can be determined by studying the growth of radon activity in vessels containing samples of the materials. It is demonstrated that the initial part of the activity growth curve determines the total free exhalation rate of the sample used, independently of container ...
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ASSESSMENT OF RADIOACTIVITY AND RADON EXHALATION RATE IN EGYPTIAN CEMENT
Health Physics, 2004The cement industry is considered as one of the basic industries that plays an important role in the national economy of developing countries. Activity concentration of 238U, 232Th, and 40K in local cement types from different Egyptian factories has been measured using a shielded HPGe detector.
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Radon Exhalation Rates and Gamma Doses from Ceramic Tiles
Health Physics, 1998This study was carried out to assess the possible radiological hazard resulting from the use of zircon in glaze applied to tiles used in buildings. The 226Ra content of various stains and glazing compounds was measured using gamma spectroscopy and the 222Rn exhalation rates for these materials were measured using adsorption on activated charcoal.
R S, O'Brien, H, Aral, J R, Peggie
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Radon Exhalation Rate of Some Building Materials Used in Egypt
Environmental Geochemistry and Health, 2005Indoor radon has been recognized as one of the health hazards for mankind. Common building materials used for construction of houses, which are considered as one of the major sources of this gas in indoor environment, have been studied for exhalation rate of radon.
A F, Maged, F A, Ashraf
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Natural radioactivity and radon exhalation rate of soil in southern Egypt
Applied Radiation and Isotopes, 2001The level of natural radioactivity in soil of 30 mining samples collected from six locations in southern Egypt was measured. Concentrations of radionuclides in samples were determined by gamma-ray spectrometer using HPGe detector with a specially designed shield.
A, Sroor +3 more
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Natural radioactivity and radon exhalation rate in Brazilian igneous rocks
Applied Radiation and Isotopes, 2011This paper reports the natural radioactivity of Brazilian igneous rocks that are used as dimension stones, following the trend of other studies on the evaluation of the risks to the human health caused by the rocks radioactivity as a consequence of their use as cover indoors. Gamma-ray spectrometry has been utilized to determine the (40)K, (226)Ra and (
Moura, C. L. +4 more
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Development and application of a continuous measurement system for radon exhalation rate
Review of Scientific Instruments, 2011A continuous measurement system, with a ventilation-type accumulation chamber, was developed for radon exhalation rate determination. A reasonable sampling flow rate for the measurement system was determined by comparing the values obtained by the system with those obtained by a grab sampling method.
Masahiro, Hosoda +4 more
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Revision for measuring radon exhalation rate in open loop
Journal of Instrumentation, 2013We propose a novel method for quickly measuring the radon exhalation rate in open loop. We first obtain the temporal variation of radon concentration in the internal cell of the RAD7 by analyzing the work principle of RAD7. We then obtain the temporal variation of radon concentration in the ventilation-type accumulation chamber when the effects of ...
Y Tan, D Xiao, H Yuan, Q Tang, X Liu
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Measuring radon exhalation rate through three cycles
Journal of Instrumentation, 2012This paper proposes that the radon exhalation rate can be calculated through three measurement cycles performed by a radon monitor based on the electrostatic collection method. The first cycle time is 20 min, the measured value in this cycle falls into disuse. The radon concentrations in the next two long cycles can be accurately measured.
Y Tan, D Xiao
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