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> isn't that high concentration going to be a lot worse for me even if I drive past every exit sign in Tokyo

No, absolutely not. Both are extremely harmless. Zero is zero; neither is more harmful than the other.

Let me put it this way: In both cases, a much bigger threat to you would be walking past the display of bananas at the local supermarket. (And no, you shouldn't be worried about the radiation from THAT either.)

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Er, all it takes is one ingested radioactive particle to damage DNA and spawn cancer. Radioactive particles from Fukushima are showing up in automobile AC filters on the West Coast, and the media hasn't said much about the MOX fuel in Reactor 3 that many experts now theorize could go critical based on the volatile (and largely untested) combination of plutonium and uranium that MOX consists of. And Japanese culture is about the worst possible mindset to deal with this cleanup effort, they are more concerned about saving face and avoiding embarrassment in front of the international community for having made the genius decision to build a bunch of nuclear reactors, some of which are using experimental MOX fuel, on top of the Shionihara Fault. They haven't even located the melted fuel in these reactors yet, and one misstep could easily result in another meltdown or worse yet a critical MOX mushroom cloud that kills millions if not hundreds of millions of humans as the result. Never mind the 850,000 tons of contaminated water they are now simply going to discharge into the ocean.

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