Abstract: p-Terphenyl is a common organic scintillator, which is usually used as the luminescent material in scintillation counters. The p-terphenyl scintillation crystal has the characteristics of high neutron detection efficiency and not easy to deliquesce, which makes it have a broad prospect in practical applications. In this paper, the vertical Bridgman method was used, and the φ12 mm×30 mm p-terphenyl scintillation crystal has grown using a single layer ampoule. The growth temperature of the crystals was determined by differential thermal test. The crystalline powder were measured by X-ray diffraction spectra, rocking curve, FT-IR spectra, fluorescence spectra and Raman spectra. The X-ray diffraction results show that the grown crystals are pure p-terphenyl phase. The rocking curve results show that the quality of the p-terphenyl crystal is good. FT-IR and Raman results show no significant shift in the peak positions, indicating that the low content of impurities in the crystals and no changement in the molecular chemical structure of the crystals. The absence of impurity peaks in the fluorescence spectra also indicates the presence of fewer impurities or crystal lattice defects in the p-terphenyl scintillation crystal.

Key words: p-terphenyl, vertical Bridgman method, crystal growth, organic crystal, scintillation crystal, single layer ampoule, radiation detection