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Wouldn't it be more effective to tell people to seal their doors and windows as good as possible and wait few days till radiation levels decrease in a hypothetical scenario where Fukushima exploded like Chernobyl and spewed fallout over Tokyo? Most radioactive stuff with short half lifes decay quickly leaving isotopes with longer half lifes but those emit less radiation. When fallout is over launch massive decontamination operation and evacuate only those areas that are too radioactive for safe long term habitation and can't be effectively decontaminated.
Well, depends on the kind of radiation and its vector. Houses are no NBC shelters. You can't seal them off. And you can't stay in your house for weeks. You need to leave it pretty often in that time. such protection is good enough, if you have toxic fumes because of a fire, that will disperse after a few hours and which you can seal off for a short time.
Most fission products in a reactor are pretty annoying for weeks, especially in dust form. The typical reactor poison of xenon-135 for example, decays in about 3 days (9 hours half-life), and is gaseous. You can't seal it off that easily, and beta decay can penetrate the simple protections. Plutonium is harmful even in traces.
Next, you need to remember that not everything is really harmless after it decayed. The decay chains of most stuff there mean something can even change from gas to dust and back during the time it is harmful.
Iodine and Calcium, the worst substances in that context for the human body, because your body absorbs them in huge quantities, are harmful for years, if a reactor would suffer from an explosion to spread them over the needed distance. The hot temperatures of the Chernobyl fire had been a blessing, since it spread the materials over a huge region, so we only had a few small hot spots where the material was concentrated. Without such a fire, the material would not travel that far and would concentrate locally, in the worst case mostly around the reactor and Tokyo, if the weather conditions are like that. Which was not that unlikely last year, in case of the weather. We had exceptional weather with late rain that time.