The nuclide 1480 is a positron emitter, decaying to an excited state of 147N. The gamma rays from this latter decay have an energy of 2.313 MeV and the maximum energy of the positrons is 1.835 MeV. The atomic mass of 14N is 14.003074 u and that of the electron is 0.000549 u. Write the equation for the decay of the oxygen isotope and sketch an energy level diagram for the process. Find the atomic mass of 140.