The binding energy of deuteron ${ }_1^2\mathrm{H}$ is 1.112 MeV per nucleon and an $\mathrm{\alpha }$-particle ${\mathrm{He}}^4$ has a binding energy of 7.047 MeV per nucleon. Then in the fusion reaction ${ }_1^2\mathrm{H}{+}_1^2\mathrm{H}{\to }_2^4\mathrm{He}+\mathrm{Q}$, the energy Q released is (in MeV)