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Uranium-238 (Uranium I) is the radioisotope of the element Uranium, whose atomic nucleus has 146 neutrons in addition to the element-specific 92 protons, resulting in a mass number of 238.
See also: list of Uranium isotopes.
Half-life T½ = 4.468(6) × 109 a respectively 1.40902848 × 1017 seconds s.
Decay mode | Daughter | Probability | Decay energy | γ energy (intensity) |
---|---|---|---|---|
α | 234Th | ca. 100 % | 4.2699(21) MeV | |
SZ | div | 10-5 % |
Graphic representation of the uranium-radium series, the natural radioactive decay series of the uranium isotope U-238.
Direct parent isotopes are: 242Pu, 238Pa.
Atomic Mass ma | Quantity | Half-life | Spin | |
---|---|---|---|---|
Uranium Isotopic mixture | 238.02891 u | 100 % | ||
Isotope 234U | 234.04095(2) u | 0.0054(5) % | 2.455(6) × 105 a | 0+ |
Isotope 235U | 235.04393(2) u | 0.7204(6) % | 7.04(1) × 108 a | 7/2- |
Isotope 238U | 238.05079(2) u | 99.2742(10) % | 4.468(6) × 109 a | 0+ |
Nuclear isomers or excited states with the activation energy in keV related to the ground state.
Nuclear Isomer | Excitation Energy | Half-life | Spin |
---|---|---|---|
238mU | 2557.9(5) keV | 280(6) ns | 0+ |
OZ | Isotone N = 146 | Isobar A = 238 |
---|---|---|
87 | 233Fr | |
88 | 234Ra | |
89 | 235Ac | |
90 | 236Th | 238Th |
91 | 237Pa | 238Pa |
92 | 238U | 238U |
93 | 239Np | 238Np |
94 | 240Pu | 238Pu |
95 | 241Am | 238Am |
96 | 242Cm | 238Cm |
97 | 243Bk | 238Bk |
98 | 244Cf | 238Cf |
99 | 245Es | |
100 | 246Fm | |
101 | 247Md |
Last update: 2023-04-19
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