Radiation level data for all of Japan’s 47 prefectures can be accessed online at the website of Japan’s Ministry of Education, Culture, Sports, Science and Technology.
The charts use a radiation unit of measurement called microsievert per hour (μSv/h). Current radiation levels in Tokyo are about 0.13 μSv/h, multiply that by the number of hours in a day and then the number of days in a year and you have the microsievert per year (μSv/y), about 1,110 μSv/y. Compare this number with the diagram below and you see that for the time being Tokyo is well within safety levels and there isn’t a huge need for panic… though a healthy measure of concern is warranted especially for children.
Lets continue to pray the remaining issues at the Fukushima nuclear power plants would be resolved soon, for the surrounding areas that have been directly effected, and that other areas of Japan hit hard by earthquake and tsunamis would receive the disaster relief needed for rescue and recovery.