Example 15.7: Calculate the energy released in the alpha decay of 238Pu to 234U. the masses involved being mp, = 238.04955 U, m, = 234.04095 u and m = 4.002603 u. HeExample 15.8: Calculate the maximum kinetic energy of the beta particle (positron) emitted in the decay of "Na , given the mass of Na = 21.994437 u, 10 Ne 21.991385 u and m = 0.00055 u.Example 15.9: The half-life of a nuclear species NX is 3.2 days. Calculate its (i) decay constant, (ii) average life and iii) the activity of its sample of mass 1.5 m