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A cloud of radioactive gas has been detected over France and large parts of Europe but the French nuclear watchdog IRSN and the International Atomic Energy Agency say there is no public health risk. The gas - iodine-131 - was first officially revealed to have been detected in the Czech Republic last week and also in Sweden, Slovakia, Hungary and Austria. It is thought to have been spreading for about two weeks. However, the IAEA said the atmospheric pollution was not caused by the Fukushima Daiichi nuclear accident in March in Japan. Iodine-131 is a short-lived radioactive isotope that has a half-life of about eight days and - with the prevailing winds across Japan carrying any airborne pollution across the Pacific towards the US - it would have all but vanished by the time it reached Europe. However, much of the radiation released by Fukushima was Iodine-131 and it is linked to increased thyroid problems. France's Institut de Radioprotection et de Sûreté Nucléaire also said the levels of radioactivity were too low to cause any risk to the public. IRSN environmental director Didier Champion said there were several possible sources: from combustion in a nuclear power plant or a research station or from a medical source that used radioactive products. He suggested that because no other isotopes were being discovered then a medical laboratory was most likely as a power plant accident would release many other isotopes. The IAEA said it hoped to have an update soon.
The IAEA has received information from the Hungarian Atomic Energy Authority (HAEA) that the source of the iodine-131 (I-131) detected in Europe was most probably a release to the atmosphere from the Institute of Isotopes Ltd., Budapest. The Institute of Isotopes Ltd. produces radioisotopes for healthcare, research and industrial applications. According to the HAEA, the release occurred from September 8 to November 16, 2011. The cause of the release is under investigation.