Results 231 to 240 of about 1,308,491 (270)
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Geochimica et Cosmochimica Acta, 1993
Abstract The mechanisms of escape of radon from the solid structure of a particle to the free pore space are examined. According to the present state of knowledge, the most important factors affecting the radon emanation coefficient are the distribution of the parent radium atoms and the internal structure of the material.
Morawska, L., Phillips, Colin R.
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Abstract The mechanisms of escape of radon from the solid structure of a particle to the free pore space are examined. According to the present state of knowledge, the most important factors affecting the radon emanation coefficient are the distribution of the parent radium atoms and the internal structure of the material.
Morawska, L., Phillips, Colin R.
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Journal of Radioanalytical and Nuclear Chemistry, 2021
A study on 222Rn emanation coefficient and mass exhalation rate was carried out for different minerals having high specific gravity collected from a natural high background radiation area of India. The mass exhalation rate varied from 31 ± 0.5 to 2366 ± 36 mBq kg−1 h−1 and the radon emanation coefficient varied from 1.02 × 10−2 to 2.04 × 10−1.
S. K. Jha +4 more
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A study on 222Rn emanation coefficient and mass exhalation rate was carried out for different minerals having high specific gravity collected from a natural high background radiation area of India. The mass exhalation rate varied from 31 ± 0.5 to 2366 ± 36 mBq kg−1 h−1 and the radon emanation coefficient varied from 1.02 × 10−2 to 2.04 × 10−1.
S. K. Jha +4 more
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Estimating the radon emanation coefficient from crystalline rocks into groundwater
Applied Radiation and Isotopes, 2000A simple method is proposed to estimate the coefficient of radon emanation from crystalline rocks into underground waters. In these cases, the crystalline rock seems as both the source and the reservoir of the radon. The calculations are based on a formula proposed by Maché for determining the concentration of radon in underground waters.
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A new method for estimating the coefficients of diffusion and emanation of radon in the soil
Journal of Environmental Radioactivity, 2014This paper describes a new method for determining the basic parameters of soil - diffusion and emanation coefficients related to the transfer of radon in the soil matrix, which are very useful for testing models, based on diffusion and characteristics of various soil matrices regarding the dangers of radon.
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American Mineralogist, 2017
The escape rates of radon gas from rocks and minerals are of great relevance to many branches of geosciences, and it is, thus, important to understand the physical and mineralogical properties that control radon emanation rates. Mechanisms of radon loss from minerals have direct bearing on the reliability of U-Pb and U-Th-He geochronology.
Katherine Krupp +2 more
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The escape rates of radon gas from rocks and minerals are of great relevance to many branches of geosciences, and it is, thus, important to understand the physical and mineralogical properties that control radon emanation rates. Mechanisms of radon loss from minerals have direct bearing on the reliability of U-Pb and U-Th-He geochronology.
Katherine Krupp +2 more
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Natural radioactivity and radon emanation coefficient in the soil of Ninh Son region, Vietnam
Applied Geochemistry, 2019Abstract The natural radioactivity (238U, 226Ra, 232Th and 40K) and radon emanation coefficient for 57 soil samples belonging to alluvial, red, forest surface, slip-debris, metamorphic and sandy soil of the Ninh Son region in Ninh Thuan province have been determined.
Huynh Nguyen Phong Thu +4 more
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Variation rules of the radon emanation coefficient in dump-leached uranium tailing sand
Journal of Radioanalytical and Nuclear Chemistry, 2019This study was intended to determine the variation rules of the radon emanation coefficient in dump-leached uranium tailing sand. A temperature and humidity controllable device for measuring the emanation coefficient was designed. Tailing sand with different grain sizes was selected from uranium tailings in southern China.
Chun-hua Huang +4 more
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Health Physics, 1989
A theoretical model of Rn emanation by a crystal lattice into the pore space of a material is presented. This model makes it possible to calculate the pore emanation rate of a material. Measurements of the 222Rn emanation coefficient of lightweight concrete for different grain sizes were performed.
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A theoretical model of Rn emanation by a crystal lattice into the pore space of a material is presented. This model makes it possible to calculate the pore emanation rate of a material. Measurements of the 222Rn emanation coefficient of lightweight concrete for different grain sizes were performed.
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Applied Radiation and Isotopes, 2001
In this paper we present a laboratory method for the determination of diffusion coefficient, D, as well as the 222Rn emanation fraction, f, in concrete core samples. It is based either on the analyses of the growth curves of the radon in the air volume surrounding a sample enclosed in an accumulation chamber (Lucas cell or RADIM device) or using the ...
C, Cosma +3 more
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In this paper we present a laboratory method for the determination of diffusion coefficient, D, as well as the 222Rn emanation fraction, f, in concrete core samples. It is based either on the analyses of the growth curves of the radon in the air volume surrounding a sample enclosed in an accumulation chamber (Lucas cell or RADIM device) or using the ...
C, Cosma +3 more
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Radiation Measurements, 2020
Abstract A study on exhalation rates of 222Rn and 220Rn and their enrichment pattern in different grain size fractions was carried out.
Primal V. Pinto +2 more
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Abstract A study on exhalation rates of 222Rn and 220Rn and their enrichment pattern in different grain size fractions was carried out.
Primal V. Pinto +2 more
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