Growth, Luminescence and Scintillation Characterization of Disodium Di-tungstate (Na₂W₂O₇) Crystal Scintillator

A single crystal of Na₂W₂O₇ was grown by using the conventional Czochralski technique. The crystal structure of the grown sample was verified by using a powder X-ray diffraction (XRD) analysis. The luminescence, as well as scintillation, properties of the crystals were evaluated at room temperature. The emission spectra of the crystal were obtained by irradiating the sample with X-ray and proton sources. The trap level of the grown crystal was studied from 325 K to 500 K, and different kinematic parameters were calculated. The scintillation properties such as; energy resolution, light yield, fluorescence decay time and α/β ratio of the crystal, were studied by using γ- (662 keV from ¹³⁷Cs) and α- (5.4 MeV from ²⁴¹Am) sources. The luminescence and the scintillation results revealed that the Na₂W₂O₇ crystal would be a good material for the dark matter search and for high-energy physics experiment.