Scintillation properties of CdWO4 single crystal grown at KAERI

The cargo screening for contraband of arms, explosives and nuclear materials is important issue in a worldwide after 9.11 terror. Also the TSA (Transportaion Security Administraion) in USA performed total inspection of air cargo by using radiation since 2010. In this experimental, the CdWO₄ single crystal was grown in oxidizing atmosphere by the Czochralski technique. As a result, not only the light yield of grown CdWO₄ was almost 70% of the commercial CdWO₄, but also other properties such as decay time, emission wavelength were similar with the commercial CdWO₄. Thus, we can check the possibility to applying for radiation detectors of medical imaging and cargo scanner. So, we have plan to improve the scintillation properties of the CdWO₄ by debugging growing conditions.