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Plutonium-238 has a half-life of 88 years and emits alpha particles. It is a heat source in radioisotope thermoelectric generators, which are used to power some spacecraft.
The most important isotope of plutonium is 239Pu, with a half-life of 24,200 years. Because of its short half-life, there are only extremely tiny trace amounts of plutonium naturally in uranium ores. It is produced in extensive quantities in nuclear reactors from natural uranium: 238U(n, gamma) --> 239U--(beta) --> 239Np--(beta) --> 239Pu.