This paper focuses on the preparation of cerium-doped yttrium aluminum garnet (YAG: Ce) powder with several concentration gradients via the sol-gel method by detecting its structural characteristics via X-ray diffraction (XRD) patterns and scanning electron microscope (SEM) to verify the generation of a complete crystal phase and evenly distributed nanopowder. On this basis, the luminescence characteristics of Ce3+ are explored, the mechanism and model are discussed based on the spectra, and the ideal doping concentration was obtained by comparing the luminescence intensity along with the fluorescence quenching theory and fluorescence decay spectra of samples with different doping concentrations. Several radiation dosimeters based on YAG: Ce phosphors were made; the online radiation monitoring function was realized under the exposure of a standard X-ray source; the repeatability, accuracy, and sensitivity of the system were verified by experiments; and the factors affecting dosimeter response are discussed. This paper verifies the possibility of adhibiting YAG: Ce fluorescent powder for online X-ray monitoring, and lays the foundation for further research.
Cerium-doped lutetium yttrium oxyorthosilicate (Lu1-xYx)2SiO5:Ce crystal powders were synthesized by co-precipitation method. The properties of LYSO:Ce powders with Y3+ concentration and Ce3+ concentration were investigated using X-ray diffraction (XRD) and photoluminescence (PL). XRD results show that LYSO:Ce powder samples with different Y3+ concentration have the same crystal phase to compare with the crystal standard card. PL results show that LYSO:Ce powder has better luminescence performance when Y3+ concentration is 15 mol%. The luminescence and scintillation characteristics of the dosimeters were founded under X-ray irradiation with low dose rate of 2.284 Gy/min and compared with the dosimeter without LYSO:Ce powder material. The luminescence and scintillation properties of LYSO:Ce dosimeter indicate promising potential applications in real time remote low dose X-ray radiotherapy and radiation monitoring.
Fluorescent fiber is used for Partial Discharge (PD) with different electrodes. The PD signal is linearly correlated with transient discharge current. Experimental results show the shape of the electrode affects the intensity of PD signal.
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