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Development and Optimization of the Tb3+/Ce3+ co-doped Gd2O3 Scintillation Glass Fiber Faceplate for Cold Neutron Microscope

Novel Tb3+/Ce3+ co-doped Gd2O3 scintillation glass fiber faceplates had been developed and successfully used for cold neutron imaging. In order to achieve the best imaging results, some optimizations were proceeded. The scintillation efficiency or scintillation light yield of the Gd2O3 scintillation glass fiber was optimized through its composition adjustment. The optimum compositions of sensitizers Tb3+ and Ce3+ are 17% and 2% (mass percent), respectively. The diameters of the glass fiber and the thickness of the faceplate were optimized through the experiments and Monte Carlo Simulation. The optimum thickness of the faceplate is 0.4mm and the diameter of glass fiber is 6μm. The imaging system made of such scintillation glass fiber faceplate achieve a spatial resolution of 35.1lp/mm and a detection efficiency of 55.3%.