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Prediction of Radionuclide Aging in Soils from the Chernobyl and Mediterranean Areas

^a Institut de Tècniques Energètiques, Universitat Politècnica de Catalunya, Av. Diagonal 647, 08028 Barcelona, Spain
^b Departament de Química Analítica, Universitat de Barcelona, Martí i Franqués 1-11, 3^a Planta, 08028 Barcelona, Spain

View larger version (58K): [in this window] [in a new window]   Fig. 1. Radiostrontium aging: effect of temperature (–20, 10, 40, and 70°C) and time (5 d: 5D; 1 mo: 1M; 4 mo: 4M; 8 mo: 8M; 12 mo: 12M) on Sr extraction yields (n = 3; bars indicate one standard deviation) in all examined soils (Entisol; Spodosol 3; Alfisol; Spodosol 5; Mollisol; Peat). Initial extraction yields (I) are represented by a hatched area (mean value ± one standard deviation). For the Spodosol 3 and Peat soils, the extraction yields of the 6 yr (6Y) field samples are also indicated by a hatched area (mean value ± one standard deviation).

View larger version (59K): [in this window] [in a new window]   Fig. 2. Radiostrontium aging: effect of temperature (–20, 10, 40, and 70°C), time, and drying–wetting cycles (5 d: 5D*; 1 mo: 1M*; 4 mo: 4M*; 8 mo: 8M*; 12 mo: 12M*) on Sr extraction yields (n = 3; bars indicate one standard deviation) in all examined soils (Entisol; Spodosol 3; Alfisol; Spodosol 5; Mollisol; Peat). Initial extraction yields (I) are represented by a hatched area (mean value ± one standard deviation). For the Spodosol 3 and Peat soils, the extraction yields of the 6 yr (6Y) field samples are also indicated by a hatched area (mean value ± one standard deviation).

View larger version (48K): [in this window] [in a new window]   Fig. 3. Radiocesium aging: effect of temperature (–20, 10, 40, and 70°C) and time (5 d: 5D; 1 mo: 1M; 4 mo: 4M; 8 mo: 8M; 12 mo: 12M) on Cs extraction yields (n = 3; bars indicate one standard deviation) in all examined soils (Entisol; Spodosol 3; Alfisol; Spodosol 5; Mollisol; Peat). Initial extraction yields (I) are represented by a hatched area (mean value ± one standard deviation). For the Spodosol 3, Spodosol 5, Mollisol, and Peat soils, the extraction yields of the 6 yr (6Y), 9 yr (9Y), and 8 yr (8Y) field samples are also indicated by a hatched area (mean value ± one standard deviation).

View larger version (46K): [in this window] [in a new window]   Fig. 4. Radiocesium aging: effect of temperature (–20, 10, 40, and 70°C), time, and drying–wetting cycles (5 d: 5D*; 1 mo: 1M*; 4 mo: 4M*; 8 mo: 8M*; 12 mo: 12M*) on Cs extraction yields (n = 3; bars indicate one standard deviation) in all examined soils (Entisol; Spodosol 3; Alfisol; Spodosol 5; Mollisol; Peat). Initial extraction yields (I) are represented by a hatched area (mean value ± one standard deviation). For the Spodosol 3, Spodosol 5, Mollisol, and Peat soils, the extraction yields of the 6 yr (6Y), 9 yr (9Y), and 8 yr (8Y) field samples are also indicated by a hatched area (mean value ± one standard deviation).