90-Th-221

Atomic Mass: 221.0181715 ± 0.0000112 amu
Excess Mass: 16926.640 ± 10.429 keV
Binding Energy: 1696423.894 ± 10.433 keV
Beta Decay Energy: B- -3439.301 ± 52.548 keV

Spin: (7/2+)
Half life: 1.68 MS ( 3.5714 % )
Mode of decay: Alpha to Ra-217
- Decay energy: 8.628 MeV
Possible parent nuclides:

Alpha from U-225