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The intermediates in the thorium-232 decay chain are all relatively short-lived; the longest-lived intermediate decay products are radium-228 and thorium-228, with half lives of 5.75 years and 1.91 years, respectively. All other intermediate decay products have half lives of less than four days. [5] The following table lists the intermediate ...
232 Th is the only primordial nuclide of thorium and makes up effectively all of natural thorium, with other isotopes of thorium appearing only in trace amounts as relatively short-lived decay products of uranium and thorium. [54]
Decay mode Half-life (a = years) Energy released MeV Decay product Short Long 252 Cf: α: 2.645 a 6.1181 248 Cm: 248 Cm α 3.4 × 10 5 a 5.162 244 Pu: 244 Pu α 8 × 10 7 a 4.589 240 U: 240 U β −: 14.1 h 0.39 240 Np: 240 Np β −: 1.032 h 2.2 240 Pu: 240 Pu α 6561 a 5.1683 236 U: 236 U Thoruranium [17] α 2.3 × 10 7 a 4.494 232 Th: 232 Th ...
Decay modes in parentheses are still not observed through experiment but are, by their energy, predicted to occur. Numbers in brackets indicate probability of that decay mode occurring in %, tr indicate <0.1%. Spontaneous fission is not shown as a theoretical decay mode for stable nuclides where other modes are possible (see these nuclides).
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Beta emission: the decay energy is 0.48 MeV and the decay product is plutonium-236. This usually decays (half-life 2.8 years) to uranium-232, which usually decays (half-life 69 years) to thorium-228, which decays in a few years to lead-208. Alpha emission: the decay energy is 5.007 MeV and the decay product is protactinium-232. This decays with ...
Most of the time (92%), it undergoes beta plus decay to 230 Th, with a minor (8%) beta-minus decay branch leading to 230 U. It also has a very rare (.003%) alpha decay mode leading to 226 Ac. [10] It is not found in nature because its half-life is short and it is not found in the decay chains of 235 U, 238 U, or 232 Th. It has a mass of 230. ...
As a member of the neptunium series, it does not occur in nature except as a product of trace quantities of 237 Np and its daughters formed by neutron capture reactions on primordial 232 Th and 238 U. [2] It is much rarer than 227 Ac and 228 Ac, which respectively occur in the decay chains of uranium-235 and thorium-232.