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Concentrations of  239 Pu,  240 Pu, and  241 Am, and atomic ratio of  240 Pu/ 239 Pu in freshly fallen snow on Mt. Zugspitze collected in 2014, 2015 and 2016 were determined by accelerator mass spectrometry (AMS). For the sub-femtogram (10 −15  g) - level of Pu and Am analysis, a chemical separation procedure combined with AMS was improved and an excellent overall efficiency of about 10 −4  was achieved. The concentration of  239 Pu ranges from 75 ± 13 ag/kg to 2823 ± 84 ag/kg, of  240 Pu from 20.6 ± 5.2 to 601 ± 21 ag/kg, and of  241 Am was found in the range of 16.7 ± 5.0–218.8 ± 8.9 ag/kg. Atomic ratios of  240 Pu/ 239 Pu for most samples are comparable to the fallout in middle Europe. One exceptional sample shows a higher Pu concentration. High airborne dust concentration, wind directions, high Cs concentrations and the activity ratio of  239+240 Pu/ 137 Cs lead to the conclusion that the sample was influenced by Pu in Saharan dust transported to Mt. Zugspitze.

Scavenged 239Pu, 240Pu, and 241Am from snowfalls in the atmosphere settling on Mt. Zugspitze in 2014, 2015 and 2016