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The special-relativistic relation connecting energy with mass, $ E^2 - (m c^2)^2= (pc)^2 $. May be used to provide accounting constraints in energy and momentum, both conserved in total, even in reactions where $m$ is not.
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Conversion of energy to mass with radioactive decay
Work it out both ways and compare the difference in mass, you should get it being zero to all intents an purposes