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Cuadro de texto:   -  Atomic Mass: 231.0358789 ± 0.0000028 amu -  Excess Mass: 33420.973 ± 2.586 keV -  Binding Energy: 1759860.436 ± 2.605 keV -  Beta Decay Energy: B- -382.155 ± 3.220 keV -  Spin: 3/2- -  Half life: 32760 years -  Mode of decay: Alpha to Ac-227 º  Decay energy: 5.149 MeV -  Mode of decay: 24NEC º  Branch ratio: 13E-10 % -  Mode of decay: SF º  Branch ratio: <=3E-10 % -  Possible parent nuclides: º  Beta from Th-231 º  Electron capture from U-231 Alpha from Np-235