Plutonium only really has two uses. As the core of a nuclear bomb. Or as the power source for RTGs which NASA uses to power Curiosity, Perseverance, the Voyager probes, and a few others. It has a few other uses in research.
However due to its use in nuclear weapons it is an extremely controlled element. Anyone making it is under the highest scrutiny and very few reactors/countries are legally allowed to make and collect it.
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