This is an aswer to the following question, Questions #4 (4 marks): Draw and label a percent depth dose graph comparing a 0.8 mm Cu HVL, 137Cs, 6-MV and 20-MV beam (assuming the same field size and SSD). Explain the differences between these 4 beams in the two main regions of the graph; when d < dmax and when d > dmax
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