Results 171 to 180 of about 1,468 (205)

Numerical simulations for radon migration and exhalation behavior during measuring radon exhalation rate with closed-loop method

Nuclear Science and Techniques/Hewuli
Ming Xia, Yongjun Ye, Shu-Yuan Liu
exaly   +2 more sources

The Determination of Radon Exhalation Rates

Health Physics, 1983
The 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 ...
openaire   +2 more sources

Field Macroradiography Measuring Radon Exhalation

Isotopenpraxis Isotopes in Environmental and Health Studies, 1978
A macroradiographic technique for measuring radon exhalation of various soils in Hungary has been developed. The method is based on long-term simultaneous measurement of the alpha-activity of soil gas at numerous points of a given area with plastic nuclear track detectors. In the present work a two-year experience related to calibration measurements in
G. Somogyi, L. Medveczky, Zs. Varga, I. Gerzson, I. Vados   +4 more
openaire   +1 more source

A new method for measuring radon exhalation

Journal of Geophysical Research: Oceans, 1983
A method for measuring radon exhalation based on the determination of radon profile into the soil by gamma spectrometry using an INa(Tl) detector is developed. Detection efficiency is determined by employing Monte Carlo method. Experimental results are described, and they show the workability of the method.
P. Fernandez, L. S. Quindos, J. Soto, E. Villar, D. Guedalia   +4 more
openaire   +1 more source

Radon exhalation rate in building materials

International Journal of Radiation Applications and Instrumentation. Part D. Nuclear Tracks and Radiation Measurements, 1991
Radon is present in trace amounts almost everywhere on the earth, being distributed in the soil, the ground water and in the lower atmosphere. Radon can originate from a deeply burried deposit and can migrate to the surface of earth by diffusion and transport process.
A. Rawat, P.J. Jojo, A.J. Khan, R.K. Tyagi, Rajendra Prasad   +4 more
openaire   +1 more source

On the exhalation of radon from the Earth

Terrestrial Magnetism and Atmospheric Electricity, 1946
Measurements 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.
openaire   +1 more source

Radon and thoron exhalation from the ground

Journal of Geophysical Research, 1973
The 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
openaire   +1 more source

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

Postprandial Changes in the Exhalation Rate of Radon Produced in Vivo

Science, 1978
The 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
openaire   +2 more sources

Radon Exhalation Rate from Various Building Materials

Health Physics, 1993
Solid-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
openaire   +2 more sources