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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.
Neptunium-239 has a half-life of about 2.4 days and decays into plutonium-239, also through beta decay. Although it does not occur naturally, uranium-233 is also a fissionable material that can be used as a fuel in nuclear reactors.To produce uranium-233, atoms of thorium -232 are exposed to neutrons. Thorium-233 forms when thorium-232 absorbs a neutron.eptunium-239 has a half-life of about 2.4 days and decays into plutonium-239, also through beta decay. Although it does not occur naturally, uranium-233 is also a fissionable material that can be used as a fuel in nuclear reactors.