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    Practice of Radiation Therapy
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    Exam 23: Photon Dosimetry Concepts and Calculations
  5. Question
    Find the PDD at 3
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Find the PDD at 3

Question 20

Question 20

Multiple Choice

Find the PDD at 3.5 cm of an 18-MV beam of radiation that has a 23 × 15 cm treatment field.


A) 99.8%
B) 98%
C) 100%
D) 98.8%

Correct Answer:

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