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Plutonium-238 power cells were used to power cardiac pacemakers some time ago (it prevented an operation to replace the battery -- back then, batteries weren't as efficient), but nowadays, long-life lithium batteries are being used.

Plutonium is toxic to the body, radioactive effects aside, so it's not used in medicine that I know of. Its half-life is somewhere in the neighborhood of 87 years, and generally you don't want something that takes that long to decay in the body.

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15y ago

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