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A radioactive pellet containing a 140keV gamma ray emitting substance with activity AmCi is placed 1m away from an Anger camera such that one-fourth of

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A radioactive pellet containing a 140keV gamma ray emitting substance with activity AmCi is placed 1m away from an Anger camera such that one-fourth of its total disintegrations hit the detector. Assume t1/2=6 hours. Assume that the Z-pulse height-that is, the photopeakis equal to the energy of the incident photon

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