研究目的
To characterize the performance of two CeBr3 scintillator detectors in terms of energy linearity, energy resolution, and time resolution using gamma sources and GEANT4 simulation.
研究成果
The CeBr3 detectors showed good linearity and energy resolution in the operating bias range of -600 V to -800 V, with a best time resolution of 423 ps at 60Co energies. GEANT4 simulations effectively reproduced experimental spectra and provided efficiency estimates, confirming the detectors' suitability for applications requiring high sensitivity and resolution.
研究不足
The GEANT4 simulation did not model backscattered gamma-rays below ~350 keV, and for AmBe source, a simplified 4.44 MeV particle gun was used instead of full spectrum, leading to discrepancies. Source strengths were not known, limiting absolute efficiency measurements to simulations only.
1：Experimental Design and Method Selection:
The study involved experimental measurements and GEANT4 simulations to evaluate detector performance. Gamma sources were used to measure linearity and resolution, with timing characteristics assessed using coincidence methods.
2：Sample Selection and Data Sources:
Two CeBr3 detectors (D1 and D2) with dimensions
3：1 mm × 1 mm were used, fabricated by Scionix Holland. Gamma sources included 22Na, 60Co, 133Ba, 137Cs, 152Eu, and AmBe. List of Experimental Equipment and Materials:
Detectors coupled with Hamamatsu R6231-100 PMTs, CAEN N842 CFD, ORTEC 567 TAC, CAEN V785 ADC, spectroscopy amplifier, and bias voltages from -600 V to -900 V.
4：Experimental Procedures and Operational Workflow:
Detectors were biased at various voltages; anode signals for timing via CFD, dynode signals for energy via amplifier. Coincidence setup with TAC for time difference measurement, data acquired using VME and LAMPS software, analyzed with ROOT.
5：Data Analysis Methods:
Linearity and energy resolution measured from spectra; time resolution extracted from Gaussian fits to TAC spectra; GEANT4 simulation for efficiency and spectrum reproduction.
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