“…The plot was labelled by a single sprinkling of 925 kBq m ÿ2 of 90 Sr in the form of soluble strontium solution (SrCl 2 ). This radioactivity is significant compared with the atmospheric fallouts in the south of France (Galle et al, 2003). The highest values generated by the nuclear weapon tests and the Chernobyl accident being, respectively, 3000 Bq m ÿ2 (1966) and 100 Bq m ÿ2 (May 7th, 1986).…”