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Rapid and Accurate Determination of <sup>226</sup>Ra from Drinking Water Using Macropa-Mediated Cloud Point Extraction Coupled with ICP-MS/MS. [PDF]
Anal ChemGovindaraj J +5 more
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Radon Emanation Coefficients for Phosphogypsum
Health Physics, 1995Phosphogypsum is a by-product of the phosphate fertilizer industry which is stockpiled in large quantities world-wide. Phosphogypsum consists mainly of dihydrate gypsum (CaSO42H2O) but also contains elevated concentrations of 226Ra and other inorganic species which originate from the processing of phosphate rock. 222Rn gas is the first decay product of
P M, Rutherford +2 more
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Emanation Coefficients for Rn in Sized Coal Fly Ash
Health Physics, 1985Emanation coefficients for 222Rn in sized samples of dry coal fly ash were evaluated as a function of source and particle size using a modification of the "sealed-can, gamma-only" technique. The emanation coefficient is defined as the fraction of Rn atoms that escape the solid particles of a source.
D R, Kalkwarf, P O, Jackson, J C, Kutt
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Determination of the thoron emanation coefficient using a powder sandwich technique
Journal of Environmental Radioactivity, 2018Thoron (220 Rn) is a natural radioactive gas, tasteless, odourless, colourless, undetectable without proper equipment. This gas is carcinogenic, just like radon (222 Rn) but due to the short half-life (55.6s) and a small amount in the environment, its share in the absorbed radiation dose is often neglected.
K. Danyłec +3 more
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Estimation of radon emanation coefficient for representative soils in Okinawa, Japan
Radiation Protection Dosimetry, 2015Radon ((222)Rn) emanation coefficients for the representative soils distributed in Okinawa Island, Japan, have been estimated empirically. Arithmetic means of the emanation coefficients for dry and moist conditions were calculated to be 0.19 and 0.29, respectively. In Okinawa, the soils are traditionally classified into three types, namely the dark red
Y, Shiroma +5 more
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Determination of the emanation coefficient and the Henry’s law constant for the groundwater radon
Journal of Radioanalytical and Nuclear Chemistry, 2010The radon emanation coefficient (e) from aquifer rock and the Henry’s law constant (H) of radon were determined by measuring activity concentrations using liquid scintillation counter (LSC). For the evaluation of the method, the coefficients were measured at 0, 10 and 20 °C and the temperature dependency of the coefficients was compared with others ...
Kil Yong Lee +2 more
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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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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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Radiation Measurements, 2011
Abstract Building materials used in Japan were collected from several companies and their radionuclide concentrations were measured. Fifteen granite samples with high activity concentrations were selected for the present study. To investigate the effect of water content on the radon emanation coefficient, the coefficient was measured under 3 ...
Miroslaw Janik +2 more
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Abstract Building materials used in Japan were collected from several companies and their radionuclide concentrations were measured. Fifteen granite samples with high activity concentrations were selected for the present study. To investigate the effect of water content on the radon emanation coefficient, the coefficient was measured under 3 ...
Miroslaw Janik +2 more
exaly +2 more sources
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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