Plutonium-238, 239-240 inventories in sediment cores from Stechlin Lake, Germany

^{238, 239-240}Pu were measured in German lake sediment coresby counting after radiochemical separation. Their distribution over the bedof the lake was determined. The lake contain 3 basins and for each basin 3sediment cores have been sliced in two subsamples. The results show that theactivity distribution is not the same over the lake and that the sedimentationrate changes in the 3 basins.