iodine-131

Fukushima radiation to the North American coast
US scientists recently reported that radiation leaked from the Fukushima plant in Japan will spread to North American coasts this year.
Russia seized radioactive material about to send to Iran
A package of radioactive isotopes for research and medical purposes was seized at an airport in Moscow, when it was about to leave for Iran.
Hungary may be a source of radioactive emissions in Europe
Air iodine-131 radioisotopes in many European countries may have spread from a research institute in Hungary.