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By considering the general conditions of nucleus stability show that the
nucleus 22⁹Th will decay and decide whether the decay will take place by
a or ß emission.
90
The atomic mass excesses of the relevant nuclei are:
Element
He
Mass excess amu × 10-6
2,603
229 pa
229 Th
229 AC
91
225 Ra
90
89
88
23,528 32,800 31,652 32,022

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