Radioactive cloud over Europe likely Russian

RUSSIA: Somewhere in Russia in the last week of September, the French government believes, something happened.

It’s hard to say much more than that, except whatever the event was, it sent a cloud of radioactive isotopes - Ruthenium-106, named after Russia - wafting over Europe for thousands of kilometres.

Also: don’t worry about it. The Institute for Radiological Protection and Nuclear Safety says wider Europe was perfectly safe from the cloud, whether it came via nuclear accident or rogue satellite crash or who-knows-what else.

‘‘It’s somewhere in South Russia,’’ agency director Jean-Christophe Gariel told NPR, after the French traced the cloud’s most likely origins to a region between the Volga River and the Ural Mountains that mark Europe’s eastern edge.

Several nuclear facilities exist in the region, NPR noted, including a problematic plant that blew up in 1957.

The agency ruled out a meltdown, concluding this week such a catastrophe would have spewed out far more radioactive material than the niche element that covered Europe in the first weeks of October.

Ruthenium-106 is used in medical research, nuclear fuel reprocessing and sometimes to power satellites. No suspect satellites were known to have fallen to earth in late September, the French agency wrote. Russian officials have denied any knowledge of an accident, according to the Associated Press.

Austria detected Ruthenium in its atmosphere on October 3. Germany the next day. Over the next two weeks the levels peaked, faded and finally disappeared.

At no point was the cloud a danger, Germany’s radiation agency wrote. You could inhale from that country’s Ruthenium cloud for a straight week and still have breathed in no more radiation than you naturally do in an hour.

By mid-October, the French agency wrote, the Ruthenium was gone altogether.