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).