Improvement of Energy Resolution and Neutron–Gamma Discrimination of NaI:Tl,6Li Single Crystal Scintillators by Ca2+ and Sr2+ Co-Doping

Jingkang Wang,Huanyin Li,Xilei Sun,Jian Shi,Guohao Ren,Chenyu Shan,Yuntao Wu,Chenger Wang,Xuemin Wen

doi:10.1109/tns.2023.3263522

Jingkang Wang, Huanyin Li + Show 7 more

https://doi.org/10.1109/tns.2023.3263522

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NaI:Tl, 6 Li single crystals due to low use cost and efficient gamma ray (γ) and neutron (n) detection capability have been regarded as promising n/γ scintillators. In this work, NaI:Tl, 6 Li single crystals co-doped with different Ca 2+ and Sr 2+ concentrations were grown by the multi-ampoule Bridgman method. Their γ-ray energy resolution and n/γ discrimination were improved. The γ-ray energy resolution at 662 keV was improved from 7.0% to 6.0% by Ca 2+ or Sr 2+ co-doping, despite at the expense of scintillation yield by around 20%. The pulse shape discrimination (PSD) expressed as Figure-of-Merits (FoM) for neutron and γ ray was enhanced from 4.65 for NaI:Tl, 6 Li to 5.85 for Ca 2+ co-doping and 5.72 for Sr 2+ co-doping. This work not only highlights the effectiveness of co-doping strategy on improvement of NaI:Tl, 6 Li single crystal scintillator, but also makes the crystal more competitive toward neutron and γ ray detection applications.

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