Mhareb M H A, Hashim S, Ghoshal S K, Alajerami Y S M, Saleh M A, Razak N A B, Azizan S A B
Department of Physics, Faculty of Science, Universiti Teknologi Malaysia, 81310, UTM Skudai Johor, Malaysia.
Radiation Protection Directorate, Energy and Minerals Regulatory Commission, 11183, Amman, Jordan.
Luminescence. 2015 Dec;30(8):1330-5. doi: 10.1002/bio.2902. Epub 2015 Mar 31.
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.
我们通过两种方法报告了镝（Dy(3+)）掺杂剂和氧化镁（MgO）改性剂对硼酸锂（LB）玻璃热释光性能的影响。热释光（TL）发光曲线显示，对于0.5 mol%的Dy(3+)，在190°C处有一个单一的突出峰。MgO含量增加10 mol%可使TL强度提高1.5倍，且最高温度没有任何偏移。这种增强归因于通过镁产生的额外电子陷阱以及向三价Dy(3+)离子的能量转移。在0.01 - 4 Gy范围内具有良好的线性，线性相关系数为0.998，在3个月的时间内衰退率低至21%，无需烘箱退火即可实现出色的重现性，且组织等效有效原子序数约为8.71。还确定了与LMB:Dy相关的陷阱参数，包括几何因子（μg）、活化能（E）和频率因子（s）。所制备玻璃的这些良好的TL特性可能有助于Li2O - MgO - B2O3辐射剂量计的开发。
