Airborne radioactivity was detected in Europe during autumn 2017, starting from the last days of September. The source is widely suspected to be in Russia; the Russian government, however, denies that any nuclear mishaps occurred that could have caused the radiation spike. The radioactive isotope detected was ruthenium-106; across Europe, it was found to be in small quantities, not significant for the health of the population far away from the source. It is estimated, however, that the radiation released posed a danger to any employees or residents within several kilometers of the currently unknown source.
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