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we have studied photon interactions and a small amount on generic rules for detectors, this is a question from a previous exam that i cannot understand.

Homework Statement (Preface: I am not a physicist) The pulse height spectrum of a radioactive source known to emit high energy photons was measured using a small detector. Three distinct peaks were observed at heights of 7.38, 6.49 and 5.60 V, along with a continuous portion of the spectrum...