Abstract
We report the nanosecond alpha-ray response and gamma-ray radiation resistance of a hydrothermal-grown bulk zinc oxide (ZnO) single crystal. For its initial screening as a scintillator material of a fusion reactor’s radiation detector, the ZnO crystal was irradiated with gamma rays from a cobalt-60 (60Co) source resulting in an absorbed dose of 10 kGy. The crystal’s response under 5.5 MeV alpha-ray excitation from an americium-241 (241Am) source was then studied through photon-counting method. The gamma-ray-irradiated crystal exhibits a pulse height distribution and a 4.5 ns scintillation decay time similar to those of a non-irradiated crystal. Our results show that hydrothermal-grown bulk ZnO single crystals have a fast response under alpha-ray excitation and that gamma-ray irradiation has no apparent effect on the crystals’ scintillation properties.
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