In early January, slightly elevated levels of iodine-131 were observed over northern and western Europe. The levels were measured during a temperature inversion, along with elevated levels of naturally occurring radioisotopes.
This, along with the deployment of an American WC-135 aircraft to the Mildenhall Royal Air Force Base in the UK, has led to speculation that the Russians have carried out a nuclear test. This is highly unlikely for several reasons.
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