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High energy density radioactive materials not commonly found on earth

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What materials would be significantly better than currently commonly used radioactive materials (Uranium/Plutonium) for energy generation?

I am looking for some material which could've been brought (so it doesn't need to occur naturally or commonly) to Earth long ago, kept hidden for thousands of years and now uncovered.

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This post was sourced from https://worldbuilding.stackexchange.com/q/79194. It is licensed under CC BY-SA 3.0.

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