研究目的
To characterize compact solid-state neutron-gamma detectors using CLYC and CLLBC crystals coupled to SiPM arrays for use in backpack or handheld instruments.
研究成果
Compact detectors using CLYC and CLLBC crystals with SiPM arrays achieve excellent energy resolution (3% for small CLLBC, 6.6% for large CLYC) and effective PSD (FOM up to 2.4), making them suitable replacements for traditional PMT-based systems in portable instruments, with potential for further optimization in light collection and electronics.
研究不足
The energy resolution for larger crystals (e.g., 2-inch CLYC) is lower (~6.6%) due to light loss from small SiPM arrays; improvements are expected with more SiPMs but may trade off PSD performance. The study is limited to specific crystal sizes and SiPM configurations tested.
1：Experimental Design and Method Selection:
Detectors were constructed by coupling CLYC and CLLBC crystals of various sizes (1-inch,
2：5-inch, 2-inch diameter right cylinders) to arrays of silicon photomultipliers (SiPM). Energy spectra and pulse shape discrimination (PSD) were measured using standard nuclear instrumentation and digitizers. Sample Selection and Data Sources:
Crystals were grown at RMD, enriched with 6Li. Sources included 137Cs for gamma energy spectra, 152Eu and 232Th for linearization, and moderated 252Cf for neutron-gamma PSD measurements.
3：List of Experimental Equipment and Materials:
CLYC and CLLBC crystals, SiPM arrays from SensL (e.g., 2x2 or 4x4 arrays with 6x6 mm elements), spectroscopic amplifier, MCA (Multichannel Analyzer), CAEN DT5720 digitizer, Teflon wrapping, airtight housing.
4：Experimental Procedures and Operational Workflow:
Crystals were coupled to SiPM arrays, wrapped with Teflon, and housed. Energy spectra were measured with a spectroscopic amplifier and MCA, linearized using gamma lines. PSD measurements used a CAEN digitizer to record event mode data, analyzed offline.
5：Data Analysis Methods:
Energy resolution calculated from photopeak FWHM, PSD scatter plots analyzed for Figure-of-Merit (FOM) to separate neutron and gamma events.
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