There have been two explosions at the Fukushima Daiichi nuclear power plant in Japan, following Friday's earthquake and tsunami, and a third reactor is reportedly at risk of fuel-rod meltdown. How great a danger do these problems pose for people in Japan and further afield?
Has there been a leakage of radioactive material?
It appears so. An American warship, the USS Ronald Reagan, has detected low levels of radiation at a distance of 100 miles (161km) from the Fukushima plant.
How much radioactive material has escaped?
This is not clear. The Japanese authorities say only very low levels of radiation have been detected outside the plant. The IAEA has described it as a level four event on the International Nuclear and Radiological Event Scale (INES), which is used for an accident "with local consequences". No abnormal levels of radiation have yet been detected in Russia.
Link Removed due to 404 Error
