Results 181 to 190 of about 2,823 (220)

Natural radioactivity and radon exhalation rate in Brazilian igneous rocks

Applied Radiation and Isotopes, 2011
This 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., Artura, A. C., Bonotto, Daniel Marcos, Guedes, S., Martinelli, C. D.   +4 more
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Radon Exhalation Rate of Some Building Materials Used in Egypt

Environmental Geochemistry and Health, 2005
Indoor 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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RADON EXHALATION RATES FROM BUILDING MATERIALS USING ELECTRET ION CHAMBER RADON MONITORS IN ACCUMULATORS

Health Physics, 2009
An electret ion chamber (EIC) radon monitor in a sealed accumulator measures the integrated average radon concentration at the end of the accumulation duration. Theoretical equations have been derived to relate such radon concentrations (Bq m(-3) ) to the radon emanation rate (Bq d(-1)) from building materials enclosed in the accumulator.
Payasada, Kotrappa, Frederick, Stieff
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Identification of sources with abnormal radon exhalation rates based on radon concentrations in underground environments

Science of The Total Environment, 2022
When there is poor ventilation or an irregular radon exhalation rate in an underground environment, it is necessary to judge whether the radon concentration is abnormal. To protect personal safety and health from radon gas, it is necessary to track the location of an abnormal radon source and measure its release rate to formulate emergency control and ...
De, Huang, Yong, Liu, Yonghong, Liu, Ying, Song, Changshou, Hong, Xiangyang, Li   +5 more
openaire   +2 more sources

Revision for measuring radon exhalation rate in open loop

Journal of Instrumentation, 2013
We 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
openaire   +1 more source

Radon exhalation rate in south-east Sicily building materials

The European Physical Journal Special Topics, 2015
One of the main contributions to indoor radon levels is given by the exhalation from building materials. For this reason we performed measurements of radon exhalation rate in materials commonly used in buildings of the eastern Sicily. The measurements were carried out by using solid state nuclear track detectors in diffusion chambers.
Morelli D, Catalano R, Filincieri R, IMME', Giuseppina, Mangano G.   +4 more
openaire   +1 more source

Measurement of radon exhalation rate from some building materials

International Journal of Radiation Applications and Instrumentation. Part D. Nuclear Tracks and Radiation Measurements, 1992
Passive integrating CR-39 plastic track detectors were used to measure the radon exhalation rate from building materials used in our region. It was found that the radon exhalation rate varies from 12.6 to 169 mBq m-2 h-1 in 10 different building materials.
A.J. Khan, Rajendra Prasad, R.K. Tyagi
openaire   +1 more source

Influence of Humidity on Building Material's Radon Exhalation Rate

Applied Mechanics and Materials, 2013
In this paper, the humidity of building materials were controlled by adopting the inorganic salts saturated solutions, and the radon exhalation rate of building materials were measured by the active carbon method which under the different humidity conditions.
Dong Ji, Zhong Yang Xu, Yun Tao Zhang
openaire   +1 more source

ASSESSMENT OF RADIOACTIVITY AND RADON EXHALATION RATE IN EGYPTIAN CEMENT

Health Physics, 2004
The 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.
openaire   +2 more sources

Radioactivity and radon exhalation rates of building materials in The Netherlands

Science of The Total Environment, 1985
About 140 samples of building materials have been analysed by gamma spectrometry for their Ra-226, Th-232 and K-40 concentrations. The radon exhalation rate was measured from concrete slabs of different composition including fly-ash components. The activity concentrations of materials containing soil products, like clay bricks and concrete, proved to ...
J G, Ackers, J F, den Boer, P, de Jong, R A, Wolschrijn   +3 more
openaire   +2 more sources