21484Po --> 21485At + 0-1b
21484Po 21485At + 0-1b
213.99519 213.99631
- 000.00055
- 213.99686 = total

Not enough mass in the original Po, so the prosess is not possible.
 

21484Po -->21082Pb + 42He
21484Po 21082Pb + 42He
213.99519 209.98413
- 004.002603
- 213.98673 = total

Po has more mass than the products so the process is possible.

Mass difference = 213.99519 - 213.98673 = 0.00846 atomic mass units

 Since 1 amu = 931 MeV, the kinetic energy of the products is 931 X 0.00849 = 7.9 MeV
 

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