This research aims to develop a combination of SiO2 and B2O3 glass former (called, silicoborate glass) to be used as a scintillation material for digital radiography application. The silicoborate glass doped with different concentration of Tb2O3, xTb2O3–7.5Gd2O3–40Na2O–5SiO2– (47.5-x)B2O3, where x = 0, 1, 2, and 3 mol% (xTb:7.5Gd) were prepared by melting and then rapid quenching in graphite mold. The density of the prepared glasses was high with Tb2O3 concentration, indicating that the glass became denser and could strongly interact with X-rays. The molar volume increased with Tb2O3 concentration, suggesting the increase of Non-Bridging Oxygen (NBOs) in glass matrix. The xTb:7.5Gd glasses absorbed photons in visible and near-infrared regions and was observed that the absorption bands increased with Tb2O3 concentration, which was the result of the 4f6-4f6 transitions behavior of Tb3+ ions. The photoluminescence and radioluminescence results revealed the distinct emission occurring at 544 nm (5D4→7F5). The photoluminescence quantum yield (PLQY) of glass had the maximum efficiency at 30.85%. The luminescence peak area under X-rays excitation glass was maximum at 109% of BGO crystal. CIE 1931 chromaticity of the xTb:7.5Gd glasses showed the color coordinates in yellowish-green area. The decay time of the xTb:7.5Gd glasses were in the millisecond range for different excitations. The probability of energy transfer was investigated between Gd3+ and Tb3+ ions in glass and may occur mainly between the 6P7/2 level of Gd3+ and 5H7 level of Tb3+. The X-rays imaging using the developed glass as a scintillator was performed by Synchrotron X-rays and the spatial resolution 6 lp/mm was achieved. These results demonstrate that the 3 mol% of Tb2O3 doped silicoborate glass can be used as a scintillator and can be applied for a high-resolution Synchrotron X-rays imaging system.

中文翻译：

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用于高分辨率同步加速器 X 射线成像应用的 Tb3+ 掺杂硅硼酸盐玻璃闪烁体


本研究旨在开发 SiO2 和 B2O3 玻璃前体（称为硅硼酸盐玻璃）的组合，用作数字射线照相应用的闪烁材料。通过熔化和熔融制备了掺杂不同浓度 Tb2O3 的硅硼酸盐玻璃，xTb2O3–7.5Gd2O3–40Na2O–5SiO2– (47.5-x)B2O3，其中 x = 0、1、2 和 3 mol% (xTb:7.5Gd)。然后在石墨模具中快速淬火。随着Tb2O3浓度的增加，所制备的玻璃的密度较高，这表明玻璃变得更加致密并且能够与X射线发生强烈的相互作用。摩尔体积随着 Tb2O3 浓度的增加而增加，表明玻璃基质中非桥接氧 (NBO) 的增加。 xTb:7.5Gd 玻璃吸收可见光和近红外区域的光子，并观察到吸收带随着 Tb2O3 浓度的增加而增加，这是 Tb3+ 离子 4f6-4f6 跃迁行为的结果。光致发光和放射发光结果显示在 544 nm (5D4→7F5) 处发生明显的发射。玻璃的光致发光量子产率(PLQY)的最大效率为30.85%。 X射线激发玻璃下的发光峰面积在BGO晶体的109%处最大。 xTb:7.5Gd 眼镜的 CIE 1931 色度显示黄绿色区域的色坐标。对于不同的激发，xTb:7.5Gd 玻璃的衰减时间在毫秒范围内。研究了玻璃中 Gd3+ 和 Tb3+ 离子之间的能量转移概率，可能主要发生在 Gd3+ 的 6P7/2 能级和 Tb3+ 的 5H7 能级之间。使用所开发的玻璃作为闪烁体通过同步加速器X射线进行X射线成像，并实现了6 lp/mm的空间分辨率。 这些结果表明，3 mol% Tb2O3 掺杂的硅硼酸盐玻璃可以用作闪烁体，并可应用于高分辨率同步加速器 X 射线成像系统。