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4. If a Nal scintillator yields 5000 scintillation photons on average for a single 140 kev gamma ray absorbed via photoelectric effect, approximately how


4. If a Nal scintillator yields 5000 scintillation photons on average for a single 140 kev gamma ray absorbed via photoelectric effect, approximately how many scintillation photons will be emitted for the imaging photopeaks of In-111 (171 kev and 245 kev)? Why is the difference in the number of scintillation photons per energy important?

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