Americium-242
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Americium-242 is a radioactive isotope of Americium with 95 protons and electrons and 147 neutrons. It has a half-life of approximately 141 years. It either decays by Isomeric transition (Here, the decay energy is 0.05MeV) or Spontaneous fission or by emmiting an alpha particle (the decay energy is 5.64 MeV and the decay product is Neptunium-238). This isotope of Americium has a mass of 242.0595492 grams/mole.