The leakage from Fukishima was much less than any of those large atmospheric nuke tests in the 1950s and 1960s — and the only precaution we had to take back then was not to eat snow, and some schools and other institutions stocked iodine pills.
My aunt was living in Reno, Nevada when the testing was being done. She said several times she and others would feel kind of sick for several days a few days after an explosion. I wonder if the population of Reno was ever sampled for radiation exposure?