Watching the news link from nhk Roku mentioned. They had a discussion of it when a Navy Ship picked up Radiation 60 miles off the coast. The 'expert" was saying similar stuff to that as well how I learn a nuclear blast from a actual bomb is 100 times more deadly and yet still even with the wind doesn't spread as deadly as people say it does. So a nuclear plant is much smaller area of infection. Can't really trust the American news, they rather scare their viewers than actually give out correct information. Why I rather watch Euro and the translated Japan link Roku gave.
Here's this Cartoon from Japan is more informative than our western news.