UNSCEAR also found no observable health effects from last year's nuclear accident in Fukushima. No effects.
The Japanese people can start eating their own food again, and moving back into areas only lightly contaminated with radiation levels that are similar to background in many areas of the world like Colorado and Brazil.
The huge waste of money that is passing for clean-up now by just moving around dirt and leaves (NYTimes) can be focused on clean-up of real contamination near Fukushima using modern technologies.
The economic and psychological harm wrought by the wrong-headed adoption of linear no-threshold dose effects for doses less than 0.1 Sv (10 rem) has been extremely harmful to the already stressed population of Japan, and to continue it would be criminal.