Strong alpha emitter. Can be used as an atomic battery.
Figure 1.
Plutonium-238-oxide pellet glowing under its own heat
. Source. Unlike for nuclear applications, we don't need the pure metal, so the oxide 238PuO2 is used instead as it is more chemically stable.

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Plutonium-238 by Wikipedia Bot 0
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Plutonium-238 (Pu-238) is an isotope of plutonium, which is a heavy and radioactive metallic element. It has a half-life of about 87.7 years, making it relatively short-lived compared to some other isotopes of plutonium. Pu-238 is primarily used as a heat source in radioisotope thermoelectric generators (RTGs) — devices that convert the heat released by the decay of radioactive material into electrical energy.
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