The slightly elevated levels of three different radioisotopes recently detected in northern Europe are probably related to a nuclear reactor which is either operating or undergoing maintenance, the International Atomic Energy Agency said in a statement on 3 July.
The recorded air concentrations of the particles were very low and posed no risk to human health and the environment, the statement said.
However, the IAEA also said the geographical origin of the release has not yet been determined.
Last week, Estonia, Finland and Sweden reported levels of ruthenium-103, caesium-134 and caesium-137 isotopes in the air which were higher than usual.
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