The Fukushima Exclusion Zone is designated as any area where the radiation exposure is above 20mSv/year.
Natural background radiation at Ramsar in Iran is in the order of 100 - 250mSv/year; Ramsar has been inhabited for at least 1,000 years, and residents are no less healthy than people living in places with far lower background radiation levels.
Guarapari in Brazil is a popular tourist destination; The Monazite in the beach sand there causes background radiation as high as 175mSv/year. No ill health effects have been reported due to this radiation exposure.
Actual studies of the health of populations exposed to radiation over their entire lifetimes in places such as Ramsar and Guarapari suggest that the current evacuation limits used by the authorities at Fukushima and at Chernobyl could be increased by a factor of ten without any effect on human health; Were this to be done, the Fukushima exclusion zone would be entirely within the site boundary of the nuclear power plant, and zero residents would need to remain evacuated.
The net number of lives saved by the evacuation of residents around the Fukushima facility after the meltdown there is almost certainly negative - that is, more people died as a result of the evacuation than were prevented from dying by the evacuation. It would have been a better public health decision had the authorities NOT chosen to evacuate anyone on radiological grounds (Some residents would still have needed to move to temporary accommodation due to the effects of the earthquake and tsunami, as many homes and a lot of infrastructure was destroyed).
The vast majority of the area around Chernobyl is also below the 200mSv/year exposure level, but there remain some genuinely dangerous hotspots (particularly in low lying areas and the basements of buildings, where the heavier fragments of the fallout have tended to accumulate) which would need to be cleaned up before it would be safe for people to return.
Restoring these areas to below 200mSv/year wouldn't be particularly difficult or expensive; But the overcautious 20mSv/year limit renders such restoration very difficult and costly. The ongoing problems at both Fukushima and Chernobyl are mostly down to inappropriately chosen dose limits, rather than to any actual risk to human health.
What experience do we have with this sort of thing? I saw a documentary about Chernobyl. There are Deer-men hiding in plain sight. People with horns and ashy skin. And yeah the surrounding nature victims don't put off an accurate reading. Chernobyl may as well be a brand of coffee. Fukushima is still an intermittent disaster occurring as we speak these last words. Could be tomorrow. You never know. Every bee may die. Bears may attack in massive packs, like ultra-intelligent wolves. Nature is screwy because of us. Doesn't everything act as a chain in nature, or whatever it is you're saying all the time?
The thing kills ROBOTS. It murders robots left and right, and we have a chance against it? The Fukushiman juice is inside us right now. Now I'm going to die, and everyone else is slowly dying - along with the planet. Even if my time frames don't exactly make sense, things escalate and 50 years is very generous considering more reactions will purposely and accidentally poison us further.
Your numbers don't mean anything to me. Appreciate them but they are just numbers. I didn't come up with them myself. The next generations will show terrible mutations. There, you can start counting up numbers. It would be an absolute cruelty to allow spawning from there. That is when math will get difficult. The end result would be worse than any fiction. The disgusting people will start eating each other. Terrible things will happen. They'll have to be done away with. All because of Fukushima... and you stand there with your elbow against the thing like nope everything is safe here! Good times! You really don't know. I don't either but things get worse before they get better, so I'm probably closer to being right.