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Effect of rare earth dopants on the radiation shielding properties of barium tellurite glasses
Nuclear Engineering and Technology ( IF 2.7 ) Pub Date : 2021-06-12 , DOI: 10.1016/j.net.2021.06.009
P. Vani , G. Vinitha , M.I. Sayyed , Maha M. AlShammari , N. Manikandan

Rare earth doped barium tellurite glasses were synthesised and explored for their radiation shielding applications. All the samples showed good thermal stability with values varying between 101 °C and 135 °C based on dopants. Structural properties showed the dominance of matrix elements compared to rare earth dopants in forming the bridging and non-bridging atoms in the network. Bandgap values varied between 3.30 and 4.05 eV which was found to be monotonic with respective rare earth dopants indicating their modification effect in the network. Various radiation shielding parameters like linear attenuation coefficient, mean free path and half value layer were calculated and each showed the effect of doping. For all samples, LAC values decreased with increase in energy and is attributed to photoelectric mechanism. Thulium doped glasses showed the highest value of 1.18 cm−1 at 0.245 MeV for 2 mol.% doping, which decreased in the order of erbium, holmium and the base barium tellurite glass, while half value layer and mean free paths showed an opposite trend with least value for 2 mol.% thulium indicating that thulium doped samples are better attenuators compared to undoped and other rare earth doped samples. Studies indicate an increased level of thulium doping in barium tellurite glasses can lead to efficient shielding materials for high energy radiation.



中文翻译:

稀土掺杂对碲酸钡玻璃辐射屏蔽性能的影响

合成并探索了稀土掺杂的碲酸钡玻璃的辐射屏蔽应用。所有样品都显示出良好的热稳定性,基于掺杂剂的值在 101°C 和 135°C 之间变化。结构特性表明,与稀土掺杂剂相比,基质元素在形成网络中的桥接和非桥接原子方面占主导地位。带隙值在 3.30 和 4.05 eV 之间变化,发现其与相应的稀土掺杂剂单调,表明它们在网络中的修饰效果。计算了各种辐射屏蔽参数,如线性衰减系数、平均自由程和半值层,每个参数都显示了掺杂的影响。对于所有样品,LAC 值随着能量的增加而降低,这归因于光电机制。-1 在 0.245 MeV 对于 2 mol.% 掺杂,按铒、钬和基础钡碲酸盐玻璃的顺序下降,而半值层和平均自由程显示出相反的趋势,2 mol.% 铥的最小值表明与未掺杂和其他稀土掺杂的样品相比,铥掺杂的样品是更好的衰减器。研究表明,在碲酸钡玻璃中增加的铥掺杂水平可以为高能辐射提供有效的屏蔽材料。

更新日期:2021-06-12
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