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  1. Give the decay equations for each of the isotopes used (2 marks)
  2. What is the major source of error in this experiment? (1 mark)
  3. What causes the Compton Edge and the backscatter peak? (2 marks)
  4. Why are there two photopeaks for cobalt? (1 mark)
  5. Comment on the resolution value you have measured. (2 marks)