研究目的
To examine the possibility of improved ??∕?? discrimination in GAGG:Ce scintillators by studying the temperature dependence of the LY and decay time for both ??- and ??-rays.
研究成果
The LY reached a maximum at around ?70 ?C for ??-rays and increased monotonously by 50% for ??-rays as the temperature decreased. The decay time constants increased as the temperature decreased. The ??∕?? PSD was found to be most efficient at room temperature.
研究不足
The study was limited to the temperature range between ?100 and +20 ?C and did not explore higher temperatures. The 1600 ns integration time was not sufficiently long to cover the whole decay tail, especially at low temperatures.
1：Experimental Design and Method Selection:
The LY and decay kinetics were measured for
2：662 MeV ??-rays from a 137Cs source and 48 MeV ??-rays from an 241Am source between ?100 ?C and room temperature. Sample Selection and Data Sources:
A single crystal of GAGG:Ce3+ with dimensions of 10×10×10 mm3 was used.
3：List of Experimental Equipment and Materials:
The crystal was wrapped in a Teflon sheet and viewed with a photomultiplier tube (PMT, Hamamatsu R2083). The temperature was controlled using liquid N2 and monitored with Pt film resistance thermometers.
4：3). The temperature was controlled using liquid N2 and monitored with Pt film resistance thermometers. Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The pulse shape of the PMT was registered with a flash ADC in a wave digitizer oscilloscope (Lecroy Wave Runner 204Mxi) and analyzed offline.
5：Data Analysis Methods:
The pulse shape was fitted with a sum of two exponentials for the decay and one exponential for the rise to obtain the LY and decay time.
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