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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.
neptunium-238: 2.117 182.9 americium-240: 2.117 182.9 lead-203: 2.16138 186.743 plutonium-247: 2.27 196 terbium-153: 2.34 202 neptunium-239: 2.356 203.6 gold-198: 2.695 232.8 fermium-253: 3.00 259 gold-199: 3.169 273.8 radium-224: 3.6319 313.80 radon-222: 3.8235 330.35 uranium-231: 4.16 359 iodine-124: 4.17 360 neptunium-234: 4.4 380 calcium-47 ...
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 ...
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.
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).
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]
A chart or table of nuclides maps the nuclear, or radioactive, behavior of nuclides, as it distinguishes the isotopes of an element.It contrasts with a periodic table, which only maps their chemical behavior, since isotopes (nuclides that are variants of the same element) do not differ chemically to any significant degree, with the exception of hydrogen.
About 338 nuclides are found naturally on Earth. These comprise 251 stable isotopes, and with the addition of the 35 long-lived radioisotopes with half-lives longer than 100 million years, a total of 286 primordial nuclides, as noted above.