Results 141 to 150 of about 571 (174)
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On the exhalation of radon from the Earth
Terrestrial Magnetism and Atmospheric Electricity, 1946Measurements were made, according to the method of Zupancic, of the rate at which the Earth exhales radon. A metal vessel was placed over a section of lawn near the Physics Building, Fordham University, and after a period of accumulation a sample of the gas was withdrawn from the vessel into an ionization‐chamber and measured for radon‐content.
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Radon and thoron exhalation from the ground
Journal of Geophysical Research, 1973The rate of radon (222Rn) and thoron (220Rn) exhalation from the ground was measured in the yard of our laboratory to investigate effects of soil conditions on the exhalation; radon and thoron gases released from the ground were directly adsorbed on granular-activated charcoal, and the charcoal was subjected to γ ray spectrometry to estimate the ...
Kazuko Megumi, Tetsuo Mamuro
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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 +5 more
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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 +5 more
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Postprandial Changes in the Exhalation Rate of Radon Produced in Vivo
Science, 1978The rate of exhalation of radon by persons with long-standing radium burdens increases about twofold shortly after a meal. The increase is short-lived and "normal" values are regained in 1.5 to 2 hours. The effect may account in part for the poor reproducibility in estimates of the freely emanating part of the radium content.
J, Rundo, F, Markun, J Y, Sha
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Radon Exhalation Rate from Various Building Materials
Health Physics, 1993Solid-state alpha-track detectors using cellulose nitrate films were used to measure the radon exhalation rates from building materials. The radon flux emitted from the surface of the building material was measured by placing an inverted cup on the top of the building material. Cellulose nitrate film was placed within the cup.
C J, Chen, P S, Weng, T C, Chu
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Radon exhalation from granites used in Saudi Arabia
Journal of Environmental Radioactivity, 2001Measurements of radon exhalation for a total of 50 selected samples of construction materials used in Saudi Arabia were taken using a radon gas analyzer. These materials included sand, aggregate, cement, gypsum, hydrated lime, ceramics and granite. It was found that the granite samples were the main source of radon emanations.
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Radon in soil gas — Exhalation tests and in situ measurements
Science of The Total Environment, 1985Radon in soil can move into buildings resulting in high radon daughter concentrations. The foundation of a dwelling should be adapted to the radon "risk" which is determined by the radon concentration and the air permeability of the soil. Different measuring procedures are discussed in this paper, both in situ measurements of radon content and ...
A, Lindmark, B, Rosen
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Radioactivity and radon exhalation rates of building materials in The Netherlands
Science of The Total Environment, 1985About 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 +3 more
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Radon exhalation and ultrafine fraction of radon progeny in closed room air
Atmospheric Environment, 1999The influence of 222Rn exhalation from walls and air exchange (low ventilation rates ...
A. El-Hussein, A. Mohammed, A.A. Ahmed
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