This is a new radiation map of Cs-137, which is summed up from March, April and May.
(Mega Bq / km2)
This is based on the data from Ministry of Education, Culture, Sports, Science and Technology, so obviously it is less than actual. It also misses Cs-134, Strontium, Uranium and Plutonium etc.
However, we could at least see where is worse than where, where is better than where.
Even if you don’t read Japanese, I guess numbers of Cesium-137 help you enough.
(Source)