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The occurrence of   238 Pu,  239(40) Pu,   241 Am,   90 Sr and   137 Cs in the region of Nassfeld (Salzburg, Austria) is discussed at four different locations by evaluating a depth profile for each radionuclide. Furthermore, the plutonium separated from the soil samples was measured by Accelerator Mass Spectrometry (AMS) to get information on the isotope ratio   240 Pu/  239 Pu. The radiochemical procedure consisted of a Pu separation step from Am and Sr by anion exchange in 8 M HNO 3  after oxidation state adjustment to Pu(IV). Am and Sr were coprecipitated with calcium oxalate. Am was separated from Sr by extraction chromatography using TRU-resin. The Sr separation was performed also by extraction chromatography using Sr-resin; after coprecipitation as oxalate,   90 Sr was measured in a gas proportional counter. For the determination of  239(40) Pu and   241 Am by α-spectrometry thin sources were prepared by microprecipitation with NdF 3 .

Vertical distribution of 238 Pu, 239(40) Pu, 241 Am, 90 Sr and 137 Cs in Austrian soil profiles