Low concentrations of the isotope Iodine-131 has been detected in the atmosphere in several European countries, the Norwegian public broadcaster NRK reports.
The countries affected are Denmark, Sweden, Czech Republic, Poland, Austria, and Hungary.
The concentrations are low and do not pose a public health risk, but the problem is that no one knows where the radioactive dust comes from. In any case, it is not from Fukushima, experts at the the International Atomic Energy Agency (IAEA) say.
“We are a little concerned, because there must be a source somewhere,” says an official of the IAEA.