9 4-10. A γ ray of 2.75 MeV from 24Na undergoes pair production in a lead shield. The negative and positive electrons possess equal kinetic energy. What is this kinetic energy? 4-11. Prove that,...

4-10. A
γ
ray of 2.75 MeV from 24Na undergoes pair production in

a lead shield. The negative and positive electrons possess equal

kinetic energy. What is this kinetic energy?

4-11. Prove that, regardless of the energy of the incident photon, a

photon scattered at an angle greater than 60 degrees during a

Compton interaction cannot undergo pair production.