Thermoluminescence properties of lithium magnesium borate glasses system doped with dysprosium oxide.
Thermoluminescence properties of lithium magnesium borate glasses system doped with dysprosium oxide.
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掺杂氧化镝的硼酸锂镁玻璃体系的热致发光性能。
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
S. A. Azizan
中科院分区：
文献类型：
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作者：
M. Mhareb;S. Hashim;S. K. Ghoshal;Y. Alajerami;M. Saleh;N. A. Razak;S. A. Azizan
本文通过两种方法研究了镝（Dy（3+））掺杂和氧化镁（MgO）改性对锂硼酸盐（LB）玻璃热释光性能的影响。热释光（TL）发光曲线显示0.5 mol% Dy（3+）在190 °C下的单个显著峰。MgO含量增加10摩尔%，TL强度提高了1.5倍，而不会引起最高温度的任何偏移。这种增强归因于通过镁产生的额外电子陷阱的发生和能量转移到三价Dy（3+）离子。在0.01-4戈伊范围内线性良好，线性相关系数为0.998，在3个月内衰减率低至21%，无需烘箱退火，重复性好，组织等效有效原子序数约为8.71。还测定了LMB：Dy的陷阱参数，包括几何因子（μg）、激活能（E）和频率因子（s）。所制备的玻璃的这些有利的热释光特性可能有助于Li_2 O-MgO-B_2 O_3辐射剂量计的发展。
We report the impact of dysprosium (Dy(3+)) dopant and magnesium oxide (MgO) modifier on the thermoluminescent properties of lithium borate (LB) glass via two procedures. The thermoluminescence (TL) glow curves reveal a single prominent peak at 190 °C for 0.5 mol% of Dy(3+). An increase in MgO contents by 10 mol% enhances the TL intensity by a factor of 1.5 times without causing any shift in the maximum temperature. This enhancement is attributed to the occurrence of extra electron traps created via magnesium and the energy transfer to trivalent Dy(3+) ions. Good linearity in the range of 0.01-4 Gy with a linear correlation coefficient of 0.998, fading as low as 21% over a period of 3 months, excellent reproducibility without oven annealing and tissue equivalent effective atomic numbers ~8.71 are achieved. The trap parameters, including geometric factor (μg), activation energy (E) and frequency factor (s) associated with LMB:Dy are also determined. These favorable TL characteristics of prepared glasses may contribute towards the development of Li2O-MgO-B2O3 radiation dosimeters.