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Update from the radiation authority in Finland -


Translation - very low levels of airborne radioactive isotopes have been detected in the last couple of weeks (Co-60, Ru-103, Cs-134, Cs-137, Zr-95, Nb-95) but they are not high quantities enough to affect normal radiation levels. They do not originate from Finland. The isotopes are the same as used on nuclear power plants and small quantities can be from normal reactor use or maintenance.

You can see realtime radiation levels here - https://www.stuk.fi/web/en/topics/environmental-radiation/ra...

If I had to have a wild guess (could be wrong) I would say it's from the Sosnovy Bor plant near St. Petersburg. https://en.wikipedia.org/wiki/Leningrad_Nuclear_Power_Plant There is ongoing work to decommission the last Chernobyl style reactors by 2025. Hope it's all going safely!

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