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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.
Technetium-99m only emits gamma rays and decays to technetium-99. Technetium-99 (99 Tc) is a major product of the fission of uranium-235 (235 U), making it the most common and most readily available isotope of technetium.One gram of technetium-99 produces 6.2Ã10 8 disintegrations a second (that is, 0.62 G Bq /g).ong-lived technetium isotopes produced commercially are by-products of fission of uranium-235 in nuclear reactors and are extracted from nuclear fuel rods.