Abstract Although naturally occurring luminescence materials such as quartz and feldspars are generally used for radiation dosimetry and dating, natural borates may also stand as a promising material for dosimetry and dating. We report thermoluminescence (TL) and optically stimulated luminescence (OSL) of one of the most abundant boron minerals in Turkey namely, ulexite (NaCaB5O6(OH)6·5H2O). An X-ray diffraction (XRD) analysis confirmed that the sample has triclinic crystal structure and contains 40.55% of B, 5.92% of Na2O, 12.3% of CaO. A thermogravimetric analysis indicates two stages of dehydration within 60–160 °C, 160–250 °C and dehydroxylation within 260–580 °C. Analysis of TL glow curves using fractional glow and deconvolution reveal that there are four glow peaks at 154, 211, 273 and 327 °C in the glow curve of ulexite. All the glow peaks follow a non-first order kinetics. The activation energies of the traps are estimated from the fractional glow curves as 0.72, 0.93, 1.16 and 1.28 eV and that evaluated from the deconvolution analysis as 0.76, 0.83, 0.96 and 1.27 eV. The lifetimes of these traps are estimated within 1.55 days–3.6 × 104 years. The radiation dose responses of the TL peaks are supra-linear between 8 Gy and 1024 Gy. OSL decay curve of ulexite consists a fast, a medium and a slow component with recombination lifetimes of (0.63 ± 0.08), (7.51 ± 0.71), (93.49 ± 3.62) s respectively. The fast OSL component obeyed first order, whereas medium and slow components obeyed general order of kinetics. The dose response of the medium and slow OSL components showed a sub-linearity from 64 Gy to 4096 Gy whereas the fast component showed linear response between 8 and 4096 Gy.

中文翻译：

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ulexite 矿物的热释光和光激发光特性

摘要 尽管天然存在的发光材料如石英和长石通常用于辐射剂量测定和测年，但天然硼酸盐也可能是一种很有前途的剂量测定和测年材料。我们报告了土耳其最丰富的硼矿物之一，即 ulexite (NaCaB5O6(OH)6·5H2O) 的热释光 (TL) 和光激发光 (OSL)。X 射线衍射 (XRD) 分析证实该样品具有三斜晶体结构，并含有 40.55% 的 B、5.92% 的 Na2O、12.3% 的 CaO。热重分析表明在 60–160 °C、160–250 °C 和 260–580 °C 内有两个脱水阶段。使用分数辉光和解卷积的 TL 辉光曲线分析表明，在 ulexite 的辉光曲线中，在 154、211、273 和 327°C 处有四个辉光峰。所有辉光峰都遵循非一级动力学。从分数辉光曲线估计陷阱的激活能量为 0.72、0.93、1.16 和 1.28 eV，从反卷积分析评估为 0.76、0.83、0.96 和 1.27 eV。这些陷阱的寿命估计在 1.55 天到 3.6 × 104 年之间。TL 峰的辐射剂量响应在 8 Gy 和 1024 Gy 之间呈超线性。ulexite 的 OSL 衰减曲线由快速、中速和慢速分量组成，复合寿命分别为 (0.63 ± 0.08)、(7.51 ± 0.71)、(93.49 ± 3.62) s。快 OSL 分量服从一阶，而中速和慢速分量服从动力学的一般顺序。