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Development And Improvement Of Cerium Activated Gadolinium Gallium Aluminum Garnets Scintillators For Radiation Detectors By Codoping, Fang Meng
Doctoral Dissertations
Ce doped Gd3Ga3Al2O12 [gadolinium gallium aluminium oxides] is considered as a promising candidate for the next generation Positron Emission Tomography material due to its high light yield in theory. This dissertation is focused on studying the Gd3Ga3Al2O12:Ce crystals by codoping, aiming to improve the light yield and decay time experimentally and understand the underlying mechanism.
The work starts from prescreening appropriate codopants for Gd3Ga3Al2O12:Ce crystals. A cost-effective method is developed to predict the performance of the single crystals by characterizing the radioluminescence intensity and photoluminescence decay of the small polycrystalline pellets. This method is demonstrated by showing that the results …
Discovery And Improvement Of Novel Metal Halide Scintillators For Radiation Detection Applications, Hua Wei
Discovery And Improvement Of Novel Metal Halide Scintillators For Radiation Detection Applications, Hua Wei
Doctoral Dissertations
Scintillation materials are in great demand for radiation detection applications. In this dissertation work, a series of new metal halide scintillation materials are presented. A comprehensive procedure of candidate scintillator screening, single crystal growth, scintillation properties characterizations, and scintillation mechanism investigations are established. The potential candidate materials are firstly synthesized by melt-freeze method to form polycrystalline. The scintillation properties of the polycrystalline specimen are characterized to select the most promising scintillators. The selected scintillators are grown into single crystals. Protocols including raw materials purification, materials pre-mixing, ampoule design, and furnace manipulation are developed to improve the scintillators’ performance.
Cerium-doped ternary …