Ra-231

Atomic Mass: 231.0412200 ± 0.0003200 amu
Excess Mass: 38396.000 ± 298.000 keV
Binding Energy: 1757232.000 ± 298.000 keV
Beta Decay Energy: B- 2486.000 ± 314.000 keV

Spin: (7/2-,1/2+)
Half life: 103 S ( 2.9126 % )
Mode of decay: Beta to Ac-231
Possible parent nuclides:

Beta from Fr-231