Wikipedia has a table: http://en.wikipedia.org/wiki/Radiation_poisoning#Exposure_levels http://en.wikipedia.org/wiki/Radiation_poisoning#Exposure_le... Accordi

Wikipedia has a table: http://en.wikipedia.org/wiki/Radiation_poisoning#Exposure_levels http://en.wikipedia.org/wiki/Radiation_poisoning#Exposure_le... According to that, fatal poisoning starts at around 2 Sv. According to the BBC, levels in the surrounding area are 8 mSv per hour, so not enough for acute poisoning given the timings, though not at all good for you. For comparison, a chest x-ray is 60 µSv.