Journal of Synthetic Crystals, Volume. 52, Issue 9, 1582(2023)
Influence of Li Doping Concentration on the Optical and Scintillation Properties of NaI∶Tl,Li Crystals
Halide scintillation crystals with neutron-gamma dual detection capabilities show broad application prospects in the field of radiation detection. High optical quality NaI∶Tl and NaI∶Tl,Li scintillation crystals were grown by Bridgman method in this paper. The photoluminescence excitation (PLE) and emission (PL), time-resolved photoluminescence, X-ray excited radioluminescence (XEL), γ-ray detection performance and neutron-gamma discrimination performance of NaI∶Tl co-doped with different Li concentrations were systematically studied. Under the excitation of X-ray, NaI∶Tl and NaI∶Tl,Li crystals show emission peaking at 345 and 410 nm respectively, which are related to sp-s2 transitions of Tl+ ion. As the increase of Li co-doping concentration, the light yield of the crystal decreases from 41 000 photons/MeV to 23 000 photons/MeV, while the energy resolution at 662 keV deteriorates from 7.0% to 9.6%. Among the tested samples, the NaI∶Tl crystal co-doped with 1% Li has the best neutron-gamma pulse shape discrimination (PSD) performance, and the neutron-gamma PSD figure-of-merits (FoM) reaches 4.56.
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WANG Jingkang, WANG Chenger, SUN Xilei, WANG Zhihua, LI Yunyun, LI Huanying, REN Guohao, WU Yuntao. Influence of Li Doping Concentration on the Optical and Scintillation Properties of NaI∶Tl,Li Crystals[J]. Journal of Synthetic Crystals, 2023, 52(9): 1582
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Received: Mar. 9, 2023
Accepted: --
Published Online: Oct. 7, 2023
The Author Email: Jingkang WANG (2560911070@qq.com)
CSTR:32186.14.