A promising high-density scintillator of GdTaO4 single crystal

Abstract

A crack-free GdTaO₄ single crystal as a promising high-density scintillator is grown successfully by the Czochralski method. High crystalline quality of the as-grown crystal has been demonstrated by its X-ray rocking curve. Its density is 8.94 g cm⁻³, which is the highest among current inorganic single-crystal scintillators. The absolute light yield of GTO is about three times as that of PbWO₄ and the scintillation decay consists of a fast component of 72.6 ns and a slow component of 1236.2 ns. Additionally, the photoluminescence measurements of GTO indicate a complicated mechanism. Its fundamental physical properties including hardness, density, and thermal properties are determined for the first time, which are very important for crystal growth and its applications.