Abstract
Publisher Summary A radon transport equation has been established from a preliminary theoretical study of radon migration through porous media such as building materials. The equation has been applied to the case of phosphogypsum because this kind of material represents a significant source of radon. With the three-dimensional model developed for simulating radon transport through different porous media, the radon concentration in 3D versus the depth in a phosphogypsum block has been studied. Experimental measurements of radon activity have also been performed by alpha spectroscopy and radon exhalation rate has been calculated for different water contents in the PG sample. The results reveal a build-up of radon exhaled from the PG sample, with a radon concentration plateau after about 7 hours even if the water saturation rate varies. By determination of the radon exhalation rate with different water contents in the sample, the influence of water has been characterized. An increase in water content provides an increase in the radon exhalation rate.
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