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Neptunium-235 has 142 neutrons and a half-life of 396.1 days. This isotope decays by: Alpha emission: the decay energy is 5.2 MeV and the decay product is protactinium-231. Electron capture: the decay energy is 0.125 MeV and the decay product is uranium-235; This isotope of neptunium has a weight of 235.044 063 3 u.
This page lists radioactive nuclides by their half-life.
Neptunium-243; Neptunium-244; Neptunium-245 This page was last edited on 29 March 2013, at 21:23 (UTC). Text is available under the Creative Commons ...
This list of nuclides shows observed nuclides that either are stable or, if radioactive, have half-lives longer than one hour. This represents isotopes of the first 105 elements, except for elements 87 (), 102 and 104 (rutherfordium).
Fission product yields by mass for thermal neutron fission of U-235 and Pu-239 (the two typical of current nuclear power reactors) and U-233 (used in the thorium cycle). This page discusses each of the main elements in the mixture of fission products produced by nuclear fission of the common nuclear fuels uranium and plutonium.
7 × 10 8 y: α: 4679 Primordial: fissile, main nuclear fuel Uranium-238: 92: 146: 4.5 × 10 9 y: α: 4267 Primordial: Main Uranium isotope Plutonium-238: 94: 144: 87.7 y: α: 5593 Synthetic: used in radioisotope thermoelectric generators (RTGs) and radioisotope heater units as an energy source for spacecraft Plutonium-239: 94: 145: 24,110 y ...
Thus they again take their places in the chain: plutonium-239, used in nuclear weapons, is the major example, decaying to uranium-235 via alpha emission with a half-life 24,500 years. There has also been large-scale production of neptunium-237, which has resurrected the hitherto extinct fourth chain. [7]
Actinium-225 (225 Ac, Ac-225) is an isotope of actinium.It undergoes alpha decay to francium-221 with a half-life of 10 days, and is an intermediate decay product in the neptunium series (the decay chain starting at 237 Np).