Title: ACTIVATION OF RADON RELEASE ON "WET" CONSERVATION OF COIL MINES

This paper presents a novel approach of measuring radon in-water in the field by inserting a MEDUSA gamma-ray detector into a 210 L or 1000 L container. The experimental measurements include investigating the effect of ambient background gamma-rays on in-field radon measurement, calibrating the detector efficiency using several amounts of KCl salt dissolved in tap water, and measuring radon in borehole water. The results showed that there is fairly good agreement between the field and laboratory measurements of radon in water, based on measurements with Marinelli beakers on a HPGe detector. The MDA of the method is 0.5 Bq L-1 radon in-water. (C) 2010 Elsevier Ltd. All rights reserved. ISSN: 0265-931X DOI: 10.1016/j.jenvrad.2010.07.005 Record 7 of 474 Author(s): Meslin, PY (Meslin, Pierre-Yves); Adler, PM (Adler, Pierre M.); Sabroux, JC (Sabroux, JeanChristophe) Title: Diffusive Transport of Gases in Wet Porous Media. Application to Radon Source: SOIL SCIENCE SOCIETY OF AMERICA JOURNAL, 74 (6): 1871-1885 NOV-DEC 2010 Abstract: The prediction of macroscopic diffusion coefficients in dry and wet porous media still strongly relies on measurements, and numerous semi-empirical correlations have been proposed over the years to replace burdensome experimentations, but the range of validity of these correlations can be limited and is not even well-defined. Here, we present ab initio numerical calculations of the diffusion coefficient of two classes of porous media, namely consolidated and unconsolidated soils, where the water phase distribution is obtained by a lattice Boltzmann technique incorporating interfacial tension and wetting. We show that these reconstructed media can well represent two categories of soils generally encountered, namely undisturbed and repacked soils, whose diffusivities, to first order, exhibit two distinct dependencies on porosity under dry conditions, but a similar dependence on the water saturation level. We provide a theoretical support to the popular Buckingham law for dry undisturbed soils in the 0.2 to 0.45 porosity range investigated here. This semi-empirical correlation also compares well with our results on wet consolidated soils, although the dependence of the diffusion coefficient on the water saturation level does not seem to be a simple power law. These results, supported by available experiments on gases such as oxygen, hydrogen, or carbon dioxide, appear to be representative of large classes of porous media. The data and their correlations relative to radon are discussed. Finally, some discrepancy with experimental data regarding the value of the percolation threshold remains, which should be investigated further in the future.