Report on the performance of a dual-mode inorganic scintillator TLYC
Abstract
TLYC (Tl26LiYCl6, >= 95% 6Li, 75.8% 35Cl, ρ = 4.5 g/cm3) is a dual-mode inorganic scintillator with the capability to detect both neutrons and γ rays with good energy resolution. The γ-ray energy resolution better than 4% was reported for a crystal size of 1'' x 1''. Unlike most neutron detectors which depend on the time-of-flight technique to determine the energy, TLYC can be sued to measure the neutron energy directly through charged-particle creating reactions on the constituent isotopes. A resolution better than 10% for fast neutrons with energies up to 8 MeV was obtained for the same class of scintillator, CLYC (Cs2LiYCl6) , where cesium is replaced by thallium for the molecular formula of TLYC. It opens the door for many applications. A crystal size of 1'' x 1'' is acquired recently and an extensive test is carried out using a 252Cf PPAC to characterize the pulse-shape discrimination between neutrons and γ rays as well as the energy and timing resolution. The prompt fission neutron and γ-ray spectra can be measured by TLYC in coincidence with the detection of fission fragments by PPAC. The detector response for both neutrons and γ rays can be measured simultaneously using this coincident technique. The characterization of those performances will be presented.
Work at LLNL is supported by the U.S. DOE under Contracts No. DE-AC52-07NA27344.- Publication:
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APS Division of Nuclear Physics Meeting Abstracts
- Pub Date:
- 2019
- Bibcode:
- 2019APS..DNP.SD003W