A neutron generator uses an $\alpha$ source, such as radium, to bombard beryllium, inducing the reaction $^4\textrm{He}+{}^9\textrm{Be} \to {}^{12}\mathrm{C} + n$. Such neutron sources are called RaBe sources, or PuBe sources if they use plutonium to get the $\alpha$s. Calculate the energy output of the reaction in MeV.