This data set comprises Plutonium measurements in undisturbed soils in the Swiss Alps. It contains 239+240Plutonium activities and 240Pu/239Pu ratios to determine the origin of the Plutonium. The samples were taken as part of HILLSCAPE (Hillslope Chronosequences and Process Evolution) in August/September 2017.

At each sampling site four replicates were taken. Samples were extracted with two Eijkelkamp type soil corers. The 0-15 cm increment was sampled with a 8 cm diameter corer, the 15-20 cm increment with a 5 cm diameter corer. Samples were cut into ca. 5cm increments and dried at 70 °C for 48 h. The plutonium extraction and measurement on ICP−MS was conducted following Ketterer et al. 2004.