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We report on the performances of CsI(Tl) crystals as γ-ray detectors, compared with standard NaI(Tl). Energy resolution from E γ =122keV up to E γ =7.6MeV and light output yield of different CsI(Tl) crystals and read-out configurations (photomultiplier tubes, photodiodes and avalanche photodiodes) have been measured.