Cuadro de texto:   -  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 -  Mode of decay: Alpha to Ra-217 º  Decay energy: 8.628 MeV -  Possible parent nuclides:    Alpha from U-225

        

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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