Mystery radiation over Europe

The IAEA reports that "very low levels of radiation, which are higher than normal but don't seem to pose a health hazard," have been registered in the Czech Republic and elsewhere in Europe. The source is unknown, but it's not Fukushima. The "very low levels of iodine-131 have been measured in the atmosphere,", and this radioisotope will lose much of its radiation in about eight days. Read more: AP.