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The report presents the results of the development of a heterogeneous scintillator for detecting thermal neutrons. A composite of NE 912 glass scintillator granules placed in a polymer binder was considered. The goal of the development is to reduce the gamma sensitivity of the detector while maintaining high efficiency to thermal neutrons. The structure of the composite was optimized using modeling in the Geant4 package. In accordance with the calculations, scintillator samples with various polymers were manufactured. Measurements on a beam of thermal neutrons and with a source of gamma rays demonstrated a decrease in the sensitivity of a heterogeneous scintillator to gamma rays by two orders of magnitude compared to homogeneous lithium glass with a slight decrease in the efficiency of neutron detection (~50%).
