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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.
User: What is the process in which an unstable atomic nucleus emits charged particles or energy or both? A. radioactivity B. oxidation C. decomposition D. none of the above. Weegy: The process in which an unstable atomic nucleus emits charged particles or energy or both is called radioactivity. Expert answered|interpersonal1|Points 40|. User: What type of nuclear decay releases energy but not a particle? A. alpha decay B. beta decay C. gamma decay D. electron decay.