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Write a two-page summary on AAPM TG-21 Calibration Protocol ragarding:

  1. What is Pwall (Eq. (9) until the end of Section IV.A)? Why is it needed? Compare it with the wall correction terms in the textbook.
  2. How the restricted stopping power ratio is determined (Section IV.B)? Please discuss:
    1. What is the cutoff energy ( the symbol here is triangle) adopted by TG-21?
    2. What is the corresponding cavity size for this (the symbol here is triangle) value?
    3. Is this cavity size reasonable for the purpose of this calibration protocol?
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