发光学报, 2023, 44 (10): 1797, 网络出版: 2023-11-27  

锌铊共掺碘化钠晶体的生长及闪烁性能

Growth and Scintillation Properties of Zinc and Thallium-codoped Sodium Iodide Crystals
作者单位
1 燕山大学 信息科学与工程学院,河北省特种光纤与光纤传感实验室,河北 秦皇岛 066004
2 燕山大学理学院 河北省微结构材料物理重点实验室,河北 秦皇岛 066004
3 秦皇岛本征晶体科技有限公司,河北 秦皇岛 066000
4 燕山大学 环境与化学工程学院,河北 秦皇岛 066004
摘要
采用坩埚下降法生长了NaI∶Zn(0,0.05%,0.08%,0.4%),Tl(0.18%)晶体。对晶体样品进行了X射线粉末衍射、电感耦合等离子体发射光谱以及紫外可见近红外透射光谱测试。结果表明,生长的晶体具有单一的物相,Zn和Tl离子掺杂并没有改变NaI的晶体结构;随着Zn掺杂浓度的增加,晶体内的Zn2+离子浓度增加、Tl+离子浓度下降;晶体透过率随Zn掺杂浓度的增加呈现先增大后减小的趋势,Zn掺杂浓度为0.08%时,样品的透过率最高,且所有样品在350~700 nm波段的透过率均高于70%。经过切割、打磨、抛光、封装等工序将NaI∶Zn,Tl晶体封装成辐射探测元件。闪烁性能测试结果表明,在137Cs放射源激发下,Zn掺量为0.05%、0.08%时的NaI∶Zn,Tl晶体的能量分辨率≤6.80%,光输出相对于NaI∶Tl晶体增加6%~10%,这有利于NaI晶体在高能粒子探测领域的进一步应用。
Abstract
NaI∶Zn(0, 0.05%, 0.08%, 0.4%),Tl(0.18%) crystals were grown using Bridgman method respectively. The crystal samples were tested by X-ray powder diffraction, inductively coupled plasma emission spectra, and ultraviolet-visible near-infrared transmission spectra. The results show that the grown crystals have a single phase, and the crystal structure of NaI does not change with Zn and Tl ions doping. As the doping concentration of Zn increases, the concentration of Zn2+ ions in the crystal increases, while the concentration of Tl+ ions decreases. The transmittance shows a trend of firstly increasing and then decreasing with the increase of Zn doping concentration. When the doping concentration of Zn is 0.08%, the transmittance of the sample is the highest. The transmittance of all the NaI∶Zn,Tl crystals is higher than 70% in the 350-700 nm wavelength range. After cutting, polishing, and packaging processes, NaI∶Zn,Tl crystals were enveloped into radiation detection components. The scintillation performance test results showed that under the excitation of a 137Cs radiation source, the energy resolution of NaI∶Zn,Tl crystals with Zn doping of 0.05% and 0.08% were less than 6.80%, and the light output increased 6%-10% compared with that of NaI∶Tl crystal. This is conducive to the further application of NaI crystals in the field of high-energy particle detection.

田东升, 张斌, 尹祖荣, 力茂林, 徐悟生, 张镇玺, 贾永超, 徐朝鹏. 锌铊共掺碘化钠晶体的生长及闪烁性能[J]. 发光学报, 2023, 44(10): 1797. Dongsheng TIAN, Bin ZHANG, Zurong YIN, Maolin LI, Wusheng XU, Zhenxi ZHANG, Yongchao JIA, Zhaopeng XU. Growth and Scintillation Properties of Zinc and Thallium-codoped Sodium Iodide Crystals[J]. Chinese Journal of Luminescence, 2023, 44(10): 1797.

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