A nano-sized, tissue equivalent, polycrystalline LiBO:Cu, Ag phosphor was synthesized for dosimetric applications. Repeated annealing, irradiation and readouts may alter the color and affect the sensitivity of the phosphor. One of the aims of the present work was to dope LiBO with an appropriate amount of Ag and Cu atoms in order to diminish such effects and consequently improve reproducibility and reusability of the dosimeter. For this purpose, LiBO was primarily doped with Ag ions, and the Cu atoms were introduced with minimal concetration. A sample co-doped with 0.35 wt% Ag and 0.015 wt% Cu exhibited optimum TL response. To facilitate handling of the material, the powdered sample was also reproduced in pellet form. Linear integrated TL response was observed from 1 mGy to 20 Gy. No change in material's sensitivity and color was observed after repeated annealing, irradiation and readout episodes. Response of the material was found to be reproducible with a COV between 1.7 and 2.3%. Thermal quenching effects with increasing heating rate were seen for the current material. Less than 5% fading was observed during a two month study. The obtained glow curve was very simple having a main dosimetric peak at about 200 ± 10 °C with two small shoulder peaks. Kinetic analysis of the glow curve was performed by an experimental method (T-T) and by curve fitting approximation. Kinetic parameters (b, s and E) were found within the prescribed limits. The promising dosimetric characteristics and the optimal glow curve favours this new material for use as a field dosimeter.

中文翻译：

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具有改进的重现性和可重复使用性的四硼酸锂 (Li2B4O7:Cu,Ag) 热释光剂量计的合成和剂量测定表征

合成了一种纳米级、组织等效的多晶 LiBO:Cu、Ag 荧光粉，用于剂量测定应用。重复退火、照射和读出可能会改变颜色并影响磷光体的灵敏度。目前工作的目的之一是在 LiBO 中掺杂适量的银和铜原子，以减少这种影响，从而提高剂量计的再现性和可重复使用性。为此，LiBO 主要掺杂有银离子，并以最小浓度引入铜原子。共掺杂 0.35 wt% Ag 和 0.015 wt% Cu 的样品表现出最佳的 TL 响应。为了便于处理材料，粉末样品也以颗粒形式复制。在 1 mGy 至 20 Gy 范围内观察到线性积分 TL 响应。经过反复退火、照射和读出后，没有观察到材料的灵敏度和颜色发生变化。发现材料的响应具有可重复性，COV 介于 1.7% 和 2.3% 之间。对于当前材料，随着加热速率的增加，可以看到热淬火效应。在两个月的研究中观察到褪色率低于 5%。获得的辉光曲线非常简单，在约 200 ± 10 °C 处有一个主剂量峰，并有两个小肩峰。通过实验方法（TT）和曲线拟合近似进行辉光曲线的动力学分析。动力学参数（b、s 和 E）均在规定限度内。有前途的剂量学特性和最佳辉光曲线有利于这种新材料用作场剂量计。