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• Eu concentration dependences of SrI 2 :Eu properties are analyzed. • Energy resolution better 4% sustains even at Eu concentration as low as 0.3 at%. • Scintillation properties of SrI2:Eu do not depend on growth method (Czochralski or Bridgman). SrI 2 :Eu crystals with the activator content of 0.1–5.5% were grown by the Bridgman-Stockbarger technique. The dependences of light yield, energy resolution, optical and luminescent properties on the Eu concentration have been studied. It has been shown that with a decrease in the amount of activator to 0.3% Eu, the energy resolution at 662 keV remains below 4%. The light yield gradually diminishes with decreasing Eu concentration. This makes it possible to revise the required amount of the expensive activator for growing high performance SrI 2 :Eu crystals. Scintillation parameters of crystals grown by the Czochralski and Bridgman-Stockbarger technique have been compared. [ABSTRACT FROM AUTHOR]