Plutonium-239 is not waste. It is fuel. Use it.
The longer the half-life, the less we care. Bismuth and tungsten are radioactive, with half-lives longer than the age of the universe, but they aren't going to hurt anybody.
The longer the half-life, the less we care. Bismuth and tungsten are radioactive, with half-lives longer than the age of the universe, but they aren't going to hurt anybody.
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