An unexpected spike in radiation has been detected over Europe this week, and experts have no idea why. An international body reported that sensors in Stockholm had picked up tiny amounts of unusual radioactive isotopes produced by nuclear fission.
The Comprehensive Nuclear Test Ban Treaty Organisation (CTBTO), which monitors the world for evidence of nuclear weapons tests, said one of its stations scanning the air for radioactive particles had found unusual, although harmless, levels of caesium-134, caesium-137 and ruthenium-103.
The isotopes were "certainly nuclear fission products, most likely from a civil source", it said. It tweeted a map showing where the material was likely to have originated, which included parts of several Baltic
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