Effects of 6LiF and 6LiCl codoping on gamma and neutron detection performance of NaI:Tl single crystal scintillators

IF 1.6 3区物理与天体物理 Q2 NUCLEAR SCIENCE & TECHNOLOGY

Radiation Measurements Pub Date : 2024-07-10 DOI:10.1016/j.radmeas.2024.107232

Jingkang Wang , Chenger Wang , Yufeng Tong , Huanyin Li , Jian Shi , Guohao Ren , Xilei Sun , Yuntao Wu

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引用次数: 0

Abstract

NaI:Tl single crystals codoped with ⁶LiI have been considered as promising neutron-gamma scintillators due to low cost, scalability, and high efficiency in detecting and discriminating neutrons and gamma-rays. This study aims to study the effects of ⁶LiF and ⁶LiCl codoping on the NaI:Tl single crystals grown by the multi-ampoule Bridgman method. The impact of ⁶LiF and ⁶LiCl on the optical properties, gamma spectroscopy, and pulse shape discrimination (PSD) of neutron and gamma detection performance were analyzed. Both ⁶LiF and ⁶LiCl caused a decrease in gamma-ray light yield and a deterioratrion of energy resolution with increasing codoping concentrations, similar to the scenarios of ⁶LiI codoping. Nonetheless, for NaI:Tl,⁶LiF, the light yield and PSD Figure-of-Merit (FoM) are almost unchanged about 37,500 photons/MeV and 4.6 when the Li content reaches 2 at%, which is better than the scenario of ⁶LiI codoping. Combing with the advantages of non-hygroscopic nature of LiF and a higher utilization yield of Li element in LiF comparing with LiI, NaI:Tl,⁶LiF single crystals could be regarded as more cost-effective scintillators for neutron detection applications.

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6LiF 和 6LiCl 共掺对 NaI:Tl 单晶闪烁体伽马和中子探测性能的影响

掺杂了 6LiI 的 NaI:Tl 单晶由于成本低、可扩展性强、探测和分辨中子和伽马射线的效率高，一直被认为是很有前途的中子-伽马闪烁体。本研究旨在研究 6LiF 和 6LiCl 共掺对采用多安培布里奇曼法生长的 NaI:Tl 单晶的影响。研究分析了 6LiF 和 6LiCl 对光学特性、伽马能谱以及中子和伽马探测性能的脉冲形状判别（PSD）的影响。随着编码浓度的增加，⁶LiF 和⁶LiCl 都会导致伽马射线光产率下降和能量分辨率降低，这与⁶LiI 编码的情况类似。然而，对于 NaI:Tl,6LiF，当锂离子含量达到 2 at% 时，光产率和 PSD 功效值（FoM）几乎保持不变，分别为 37,500 光子/兆电子伏和 4.6，优于 6LiI 编码的情况。与 LiI 相比，NaI:Tl,6LiF 单晶具有 LiF 无吸湿性和 LiF 中 Li 元素利用率更高的优点，因此可被视为中子探测应用中更具成本效益的闪烁体。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Radiation Measurements 工程技术-核科学技术

CiteScore

4.10

自引率

20.00%

发文量

116

审稿时长

48 days

期刊介绍： The journal seeks to publish papers that present advances in the following areas: spontaneous and stimulated luminescence (including scintillating materials, thermoluminescence, and optically stimulated luminescence); electron spin resonance of natural and synthetic materials; the physics, design and performance of radiation measurements (including computational modelling such as electronic transport simulations); the novel basic aspects of radiation measurement in medical physics. Studies of energy-transfer phenomena, track physics and microdosimetry are also of interest to the journal. Applications relevant to the journal, particularly where they present novel detection techniques, novel analytical approaches or novel materials, include: personal dosimetry (including dosimetric quantities, active/electronic and passive monitoring techniques for photon, neutron and charged-particle exposures); environmental dosimetry (including methodological advances and predictive models related to radon, but generally excluding local survey results of radon where the main aim is to establish the radiation risk to populations); cosmic and high-energy radiation measurements (including dosimetry, space radiation effects, and single event upsets); dosimetry-based archaeological and Quaternary dating; dosimetry-based approaches to thermochronometry; accident and retrospective dosimetry (including activation detectors), and dosimetry and measurements related to medical applications.