Plutonium-239
Isotope
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Plutonium-239 is an isotope of plutonium. Plutonium-239 is the primary fissile isotope used for the production of nuclear weapons, although uranium-235 is also used for that purpose. Wikipedia
Protons: 94
Number of neutrons: 145
Half-life (t1/2): 24110 years
Parent isotopes: 243Cm (α); 239Am (EC); 239Np (β−)
Spin: +1⁄2