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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 ...
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It mainly (98.62%) undergos beta decay, but sometimes (1.38%) it will undergo alpha decay instead. [ 1 ] 227 Ac is a member of the actinium series . It is found only in traces in uranium ores – one tonne of uranium in ore contains about 0.2 milligrams of 227 Ac.
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. ...
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).
Uranium-232 (232 U) is an isotope of uranium.It has a half-life of around 69 years and is a side product in the thorium cycle.It has been cited as an obstacle to nuclear proliferation using 233 U as the fissile material, because the intense gamma radiation emitted by 208 Tl (a daughter of 232 U, produced relatively quickly) makes the 233 U contaminated with it more difficult to handle.