Radiation near Fukushima
A news crew drives into the evacuation zone around the Fukushima Nuclear Power Plant in the following video. The place is a ghost town (other than animals), and damage from the earthquake and tsunami has gone unrepaired. Although their Geiger counter goes off whenever they hit the “legal limit,” the levels really aren’t that bad. Most of the time within the zone radiation is at 1 or 2 μSv per hour. For comparison purposes, 0.34μSv/h is average for living in the USA, so inside the radiation zone they are getting about 5 times what Americans are normally experiencing in an hour. They peak at about 8 μSv per hour, but that doesn’t seem to last long. Even when they are really close to the reactor they sometimes have levels only a few times what people living thousands of miles away experience on an hourly basis.
During their entire time in the zone (assuming they were in it for a couple hours), they probably encountered less radiation than what a person is exposed to in a dental exam (and hundreds of times less than what a person getting a mammogram receives).