https://www.bfs.de/SharedDocs/Kurzmeldungen/BfS/EN/2017/1003-ruthenium-106.html https://www.bfs.de/SharedDocs/Kurzmeldungen/BfS/EN/2017/1003... Actual measurem

https://www.bfs.de/SharedDocs/Kurzmeldungen/BfS/EN/2017/1003-ruthenium-106.html https://www.bfs.de/SharedDocs/Kurzmeldungen/BfS/EN/2017/1003... Actual measurements, though not very specific on where this was measured: "a few microbecquerel to 5 millibecquerel per cubic metre [of] air."