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- W2035251966 abstract "Nearly 1.0 × 108 tonnes of phosphogypsum were accumulated during last 50 years on a 1200 ha disposal site near Huelva town (SW of Spain). Previous measurements of exhalation rates offered very variable values, in such a way that a worst case scenario could not be established. Here, new experimental data coupled to numerical simulations show that increasing the moisture contents or the temperature reduces the exhalation rate whilst increasing the radon potential or porosity has the contrary effect. Once the relative effects are compared, it can be drawn that the most relevant parameters controlling the exhalation rate are radon potential (product of emanation factor by 226Ra concentration) and moisture saturation of PG. From wastes management point of view, it can be concluded that piling up the waste increasing the height instead of the surface allows the reduction of the exhalation rate. Furthermore, a proposed cover here is expected to allow exhalation rates reductions up to 95%. We established that the worst case scenario corresponds to a situation of extremely dry winter. Under these conditions, the radon exhalation rate (0.508 Bq m−2 s−1) would be below though close to the upper limit established by U.S.E.P.A. for inactive phopsphogypsum piles (0.722 Bq m−2 s−1)." @default.
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- W2035251966 date "2014-09-01" @default.
- W2035251966 modified "2023-10-16" @default.
- W2035251966 title "Studying radon exhalation rates variability from phosphogypsum piles in the SW of Spain" @default.
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- W2035251966 doi "https://doi.org/10.1016/j.jhazmat.2014.07.025" @default.
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