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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 is a widely used radioactive tracer isotope in Nuclear Medicine.It's gamma ray energy of about 140 keV is convenient for detection. The fact that both its physical half-life and its biological half-life are very short leads to very fast clearing from the body after an imaging process.echnetium -99m is a widely used radioactive tracer isotope in Nuclear Medicine.