Abstract In this study, we report optimized dosimetric characteristics of magnesium doped lithium tetraborate Li2B4O7: Mg adopting the thermoluminescence technique. The phosphor material was synthesized using a melting zone method in the stoichiometric ratio shown by Li2CO3.H2O + H3BO3 → 2Li2B4O7. The sample obtained was doped with Mg to obtain Li2B4O7: Mg at dopant concentrations of 0.05 wt %, 0.3 wt %, and 0.5 wt %. The crystallinity and the phase purity of the obtained crystal samples were characterized by X-ray diffraction (XRD) spectroscopy, the morphology was obtained by scanning electron microscopy (SEM) and the absorbance by UV–visible spectroscopy. At 0.05 wt% and 0.3 wt% dopant concentrations, the XRD analysis of the samples obtained was pseudo crystalline, but at a higher concentration of 0.5 wt% dopant a crystal with two defined peaks was obtained. The SEM result showed grains with agglomeration for 0.05 wt% and 0.3 wt%, but with a higher concentration of 0.5 wt%, we obtained grains of different sizes with slight agglomeration. The UV–Visible absorption curves gave a surface plasmon resonance (SPR) peak at about 930–932 nm. The obtained crystal samples were irradiated using a Co-60 gamma-ray source. The thermoluminescence glow curves of Li2B4O7: Mg consist of a simple and single peak. Li2B4O7: Mg was found to have tissue equivalence (Zeff ≈ 7.32) and linear dose-response up to 2.4 Gy of gamma rays. The order of kinetics determined using the ID method was found to be 2. All these, coupled with an easy method of preparation, good sensitivity, simple glow curve and linear response over a significant range of doses are some of the good characteristics of the prepared phosphor which make it a better option for radiation dosimetry and monitoring.

中文翻译：

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多晶 Li2B4O7 的表征和伽马剂量响应：熔融区法制备的镁磷光体

摘要 在这项研究中，我们报告了采用热释光技术的镁掺杂四硼酸锂 Li2B4O7:Mg 的优化剂量学特性。磷光体材料是使用熔化区法以 Li2CO3.H2O + H3BO3 → 2Li2B4O7 所示的化学计量比合成的。获得的样品掺杂有Mg，以获得掺杂剂浓度为0.05wt％、0.3wt％和0.5wt％的Li 2 B 4 O 7 ：Mg。所得晶体样品的结晶度和相纯度通过 X 射线衍射 (XRD) 光谱表征，形貌通过扫描电子显微镜 (SEM) 获得，吸光度通过紫外-可见光谱获得。在 0.05 wt% 和 0.3 wt% 掺杂浓度下，所得样品的 XRD 分析为假结晶，但在更高的浓度为 0. 获得了具有两个确定峰的5wt%掺杂剂的晶体。SEM 结果显示颗粒在 0.05 wt% 和 0.3 wt% 时发生团聚，但在 0.5 wt% 的较高浓度下，我们获得了具有轻微团聚的不同尺寸的颗粒。紫外-可见吸收曲线在约 930-932 nm 处产生表面等离子体共振 (SPR) 峰。使用Co-60伽马射线源照射获得的晶体样品。Li2B4O7:Mg 的热释光曲线由一个简单的单峰组成。Li2B4O7: Mg 被发现具有组织等效性 (Zeff ≈ 7.32) 和高达 2.4 Gy 的伽马射线的线性剂量反应。发现使用 ID 方法确定的动力学顺序为 2。所有这些，加上简单的制备方法，良好的灵敏度，