The Guardian: A secretive Russian nuclear facility has denied it was behind high atmospheric concentrations of the radioactive isotope ruthenium-106, after Russia's meteorological service confirmed levels several hundred times the norm were found in several locations in the country during tests in late September.
Greenpeace has called for an investigation into a potential cover-up of a nuclear accident after Russia's nuclear agency had denied European reports of increased ruthenium-106 levels. Rosgidromet, the weather monitoring service, released test data on Monday that showed levels were indeed much higher than normal. The most potent site was Argayash in the south Urals, where levels were 986 times the norm.
Argayash is about 20 miles from Mayak, a facility that reprocesses spent nuclear fuel. The plant facility issued a denial on Tuesday. "The contamination of the atmosphere with ruthenium-106 isotope registered by Rosgidromet is not linked to the activity of Mayak," a statement said.
It went on to reassure people that the measurements were well below dangerous levels: "The measurements which Rosgidromet has released suggest that the dose people might have received is 20,000 times less than the allowed annual dose and presents no threat at all to health."
Nuclear experts also said there was no evidence to suggest the leak posed a significant hazard to human health or the environment.
A report earlier this month from France's Institute for Radioprotection and Nuclear Safety (IRSN) said ruthenium-106 had been detected in France between 27 September and 13 October.
In mid-October, the state nuclear agency Rosatom issued a statement saying that samples from across Russia during the same period showed no trace of ruthenium-106 after European agencies had reported levels that were higher than usual.