The red thermoluminescence (RTL) emission of quartz is associated with advantageous features such as high saturation dose and good reproducibility. Previous studies, however, noted inexplicable RTL glow curve shapes with new peaks at large doses (kGy range). Here we present TL spectra of two granitic quartz samples over the additive γ-dose range 0.1–47.9 kGy. While for doses between 0.4 and 1 kGy the TL spectra are dominated by the red emission at 1.95 eV (630 nm), a blue emission at 2.67 eV (465 nm) becomes prominent for higher doses. For one sample, this blue component completely dominates the spectrum for doses > 12.2 kGy with intensity maxima around 200 °C and > 350 °C (heating rate 2 K s−1). The other sample still contains well resolvable red and blue emissions at the largest dose with similar TL peak positions. Signal saturation for the blue emission in the glow curve range 260–300 °C is not yet reached following an additive γ-dose of 47.9 kGy, whereas the red emission generally shows a more subdued signal response for doses > 5–12 kGy. These findings agree qualitatively with additional monochromatic blue and red TL measurements on the same samples. The evolution of supplementary radiofluorescence spectra over the entire γ-dose range is more complex, but suggests that the sensitisation of the blue wavelength region occurs during heating and not during irradiation and through creation of electron traps rather than recombination centres (most likely [AlO4]0 sites). The sharp sensitivity increase at 1 kGy might likewise be related to alkali ion redistribution and/or the removal of non-radiative competitive recombination pathways. While the blue emission still requires thorough investigation, care should be taken when recording RTL using optical filters since significant portions of the registered TL could originate from the blue component entering the RTL transmission window. In practical terms, the dose-dependent change in relative intensities of blue and red TL emissions might help in detecting exposure to high doses.

中文翻译：

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高剂量范围内的石英热释光光谱

石英的红色热释光 (RTL) 发射具有诸如高饱和剂量和良好再现性等优点。然而，之前的研究指出，在大剂量（kGy 范围）下会出现无法解释的 RTL 辉光曲线形状和新峰。在这里，我们展示了两个花岗岩石英样品在 0.1-47.9 kGy 的附加 γ 剂量范围内的 TL 光谱。虽然对于 0.4 和 1 kGy 之间的剂量，TL 光谱主要由 1.95 eV (630 nm) 的红色发射支配，而在 2.67 eV (465 nm) 的蓝色发射对于更高的剂量变得突出。对于一个样品，该蓝色成分在剂量 > 12.2 kGy 的光谱中完全占主导地位，强度最大值约为 200 °C 和 > 350 °C（加热速率为 2 K s−1）。另一个样品在最大剂量下仍包含可很好分辨的红色和蓝色发射，具有相似的 TL 峰位置。在 47.9 kGy 的附加 γ 剂量后，尚未达到辉光曲线范围 260–300 °C 中蓝色发射的信号饱和，而红色发射通常在剂量 > 5–12 kGy 时显示出更柔和的信号响应。这些发现与对相同样品的额外单色蓝色和红色 TL 测量结果一致。在整个 γ 剂量范围内补充放射性荧光光谱的演变更为复杂，但表明蓝色波长区域的敏化发生在加热期间而不是在辐照期间以及通过创建电子陷阱而不是复合中心（很可能 [AlO4] 0 个站点）。1 kGy 时灵敏度的急剧增加可能同样与碱离子重新分布和/或非辐射竞争性重组途径的去除有关。虽然蓝色发射仍然需要彻底调查，但在使用滤光片记录 RTL 时应小心，因为注册的 TL 的很大一部分可能源自进入 RTL 传输窗口的蓝色分量。实际上，蓝色和红色 TL 发射相对强度的剂量依赖性变化可能有助于检测高剂量暴露。