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Lecture 7Q1. What is Radiotherapy? Describe different categories of Radiotherapy? State Ionizingphoton radiation? Describe Radiation dosimetry with its entities?Q2. What are the PHOTON SOURCES FOR EXTERNAL BEAM THERAPY? Describemono-energetic photon beam and heterogeneous photon beam with an example each?Q3. What is the inverse square law of external beam radiotherapy? How is photon beampropagation related to inverse square law?.