Radiation and contamination are different, you can't just compare dosage levels in different scenarios.
If you wore a mask and suit all the time living next to Fukushima, it would not change how much radiation you get because plastic suits don't block radiation. But you would be vastly more healthy because you would avoid the contamination.
Essentially if you inhale radioactive particles they stay inside you and continue to radiate, and the substances themselves are often very toxic. This is the main concern.
If you wore a mask and suit all the time living next to Fukushima, it would not change how much radiation you get because plastic suits don't block radiation. But you would be vastly more healthy because you would avoid the contamination.
Essentially if you inhale radioactive particles they stay inside you and continue to radiate, and the substances themselves are often very toxic. This is the main concern.