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The radionuclide ^{11}C decays according to

The maximum energy of the emitted positron is 0.960 MeV.

Given the mass values:

m (^{11}_{6}C) = 11.011434 u and m (^{11}_{5}B) = 11.009305 u,

calculate Q and compare it with the maximum energy of the positron emitted.