Beta- decay and mass deficit

[IniquiTrance]

1. The problem statement, all variables and given/known data

To find the total Kinetic Energy of the decay products, given the mass-energies of each particle.

2. Relevant equations



3. The attempt at a solution

I'm assuming the mass deficit is the total kinetic energy. Is this true?

If it is, then how do you rule out release of EM radiation as a consequence of the decay? Does EM radiation fall under the rubric of KE?

Thanks!