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Cuadro de texto:   -  Atomic Mass: 238.0507826 ± 0.0000021 amu -  Excess Mass: 47303.664 ± 1.980 keV -  Binding Energy: 1801694.651 ± 2.006 keV -  Beta Decay Energy: B- -147.065 ± 1.145 keV -  Atomic Percent Abundance: 99.2745% -  Spin: 0+ -  Half life: 4.468E+9 years -  Mode of decay: Alpha to Th-234 º  Decay energy: 4.270 MeV -  Mode of decay: SF º  Branch ratio: 0.00005 % -  Possible parent nuclides:                                                                Beta from Pa-238                                                                Alpha from Pu-242