It has been difficult to find well-reasoned information about the aftermath of the earthquake and the situation in Fukushima. Here is one web page that we think is worth reading.
The latest advice on Japan from the Government’s Chief Scientific Adviser
The first thing to say is that although the situation is still extremely serious it’s improved for two reasons. First, TEPCO has now established an electricity supply to the plants, and is now able to use freshwater for cooling the reactors and it’s really helped a lot. Second, the natural processes of radioactive decay coupled with the short half life of Iodine 131, means that any threats to your health from any future emissions at the plant have significantly reduced.
Read the web page: http://ukinjapan.fco.gov.uk/en/news/?view=News&id=581967082