The half-life of an element doesn’t really say anything about the energy release per-atom when fission occurs.
Fr223 to Ra223 produces 1.149 MeV of energy
Boring U238 to Th234 produces 4.270 MeV of energy, but only once every 5 billion years.
Shorter half-life isotopes release more heat overall because the decay is so much faster, but all this really does is make the material difficult to process and handle.
The heat buildup is often sufficient to melt or vaporize samples, rendering them useless.
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