alternate_names = U-239
abundance = 0 (Artificial)
halflife = 23.45 mins
background = #fc6
decay_mass = 239
decay_energy1 = 1.28
decay_energy2 = 1.21
decay_energy4 = Uranium-239 is an isotope of uranium. It is usually produced by exposing
uranium-238to neutron radiationin a nuclear reactor. Uranium-239 has a half-life of about 23.45 minutes and decays into neptunium-239through beta decay, with a total decay energy of about 1.29 Mev. [CRC Handbook, 57th Ed. p. B-345] . The most common gamma decay at 74.660 kev accounts for the difference in the two major channels of beta emission energy, at 1.28 and 1.21 Mev. [Ibid. p. B-423]
Neptunium-239 further decays to
plutonium-239, in a second important step which ultimately produces fissile plutonium-239 (used in weapons and for nuclear power), from uranium-238 in reactors.
[http://www.euronuclear.org/info/encyclopedia/breeding.htm The European Nuclear Society]
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