MOSCOW (Reuters) - Russia's meteorological service said on Tuesday it had measured pollution of a radioactive isotope at nearly 1,000 times normal levels in the Ural mountains, the first official Russian data supporting reports that a nuclear incident had taken place.
The data appears to back up a report by the French nuclear safety institute IRSN, which said on Nov. 9 a cloud of radioactive pollution over Europe had indicated some kind of leak had taken place at a nuclear facility either in Russia or Kazakhstan in the last week of September.
Neither Russia nor Kazakhstan has acknowledged any accident.
Russian state weather service Roshydromet said in a statement it had found "extremely high pollution" of ruthenium 106 in samples from two meteorological stations in the southern Urals region in late September and early October.
At the Agrayash weather station the levels were 986 times those of the previous month, while at the Novogorny station they were 440 times higher. The weather service did not rule out that the radioactive isotope could be absorbed into the atmosphere and reach Europe.
Western scientists said the ruthenium 106 levels disclosed did not by themselves indicate any major health threat, although it was still unclear what had happened.
"Ruthenium is very rare and hence its presence may suggest that an event of some nature has occurred. That being said, the natural abundance is so low that even a factor of 900 up on natural levels is still very low," said Malcolm Sperrin, director of the Department of Medical Physics and Clinical Engineering at Oxford University Hospitals in England.
Professor Paddy Regan at the University of Surrey said the fact that the ruthenium was found in isolation, rather than with other radioactive materials "suggests a leak from a fuel/reprocessing plant or somewhere they are separating the ruthenium" rather than a bigger nuclear accident.
"If it was a reactor leak or nuclear explosion, other radioisotopes would also be present in the 'plume' and from the reports, they are not," Regan said.
He said any health effect would be negligible.
"The measurement of its presence in the amounts reported suggest that any biological effects of exposure to this source are essentially similar to that of the normal, naturally occurring radiation background," he told Reuters.
Russia's Consumer Rights Protection service said in a statement that the ruthenium 106 posed no threat to public health.
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