Results 231 to 240 of about 3,648 (254)
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Effects of Intraparticle Porosity on the Radon Emanation Coefficient
Environmental Science & Technology, 1996An analysis of the effects on the radon emanation from individual material particles by the direct recoil process and the intraparticle porosity is presented. The purpose is to fill the gap in knowledge for a comprehensive theoretical explanation of the nature of the radon emanation processes.
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Theoretical Evaluation of the 222Rn Emanation Coefficient for Coal Fly Ash
Health Physics, 1987The release of 222Rn, from individual material grains in which it is formed, may be largely a diffusion process. This paper presents an analytical model purporting to describe the physical process of the release of 222Rn atoms from a 226Ra-bearing material grain.
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The effects of capillarity on the contraction coefficient of a jet emanating from a slot
The Physics of Fluids, 1987This study is concerned with the effects of surface tension on the steady potential flow of a liquid issuing from a two-dimensional slot with inclined walls. The mathematical problem, which is characterized by a nonlinear boundary condition along the free streamline, is solved using a novel numerical technique based on the fast direct Poisson solver ...
Ackerberg, R. C., Liu, Tajo
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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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A new method for estimating the coefficients of diffusion andĀ 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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Radon emanation coefficient study of a geological sample
1999The radon atom can escape from the material it was formed in by direct recoil or by diffusion. It then enters either an inter or intra-granular space. Next, the radon atom can migrate by diffusion or convection in order to reach the atmosphere. The emanation coefficient is defined as the ratio between the number of radon atoms that escape from the ...
Ozgumus, A. +2 more
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Journal of Radioanalytical and Nuclear Chemistry, 1997
Radon Ī±-activity concentrations have been measured inside and outside various building materials by combining a calculational method with the solid state nuclear track detector (SSNTD) technique. Radon emanation coefficients of the studied materials have been evaluated.
M. A. Misdaq, H. Moustaaidine
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Radon Ī±-activity concentrations have been measured inside and outside various building materials by combining a calculational method with the solid state nuclear track detector (SSNTD) technique. Radon emanation coefficients of the studied materials have been evaluated.
M. A. Misdaq, H. Moustaaidine
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Two ways of determining the 222Rn emanation coefficient.
Health physics, 1989The purpose of the present work was to determine the 222 Rn emanation coefficient in two ways using one series of measurements of 222 Rn concentration growth in an emanation chamber containing a sample of a material. In each method, different features of the material and different values obtained in the experiment were utilized.
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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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Radiation Physics and Chemistry, 1998
Abstract Radon alpha-activities per unit volume have been measured inside and outside different building material samples by using CR-39 and LR-115 type II solid state nuclear track detectors (SSNTD). Radon emanation coefficients of the studied building materials have been evaluated.
M.A. Misdaq, H. Khajmi, A. Ktata
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Abstract Radon alpha-activities per unit volume have been measured inside and outside different building material samples by using CR-39 and LR-115 type II solid state nuclear track detectors (SSNTD). Radon emanation coefficients of the studied building materials have been evaluated.
M.A. Misdaq, H. Khajmi, A. Ktata
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