EPR (electron paramagnetic resonance) spectra of quartz samples, γ-irradiated with varying absorbed doses (0–8000 Gy), were measured at different temperature levels (294–94 K). The temperature dependence of the E1′, Ge, peroxy, Al, and Ti centers was systematically investigated, and a phenomenological model was developed to theoretically explain the temperature saturation phenomenon. The experimental results indicated that the temperature dependence of different paramagnetic centers varies, primarily due to differences in the spin-lattice relaxation processes. Under the limited experimental conditions and temperature range, reliable conclusions regarding the temperature dependence of equivalent dose (DE) could not be drawn. The simulation results demonstrated that DE values obtained at higher temperatures are closer to intrinsic one, while those obtained in the temperature saturation region are questionable. Additionally, measurement recommendations to avoid signal interference were provided by comparing spectra at different temperatures and power levels. In the context of inconsistent spin-lattice relaxation times (T1) among the series aliquots, a more precise characterization of the temperature dependence of T1 is essential for further enhancing dating reliability and presents a challenge for relative quantitative EPR.

中文翻译：

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石英顺磁中心的温度依赖性 EPR 特性：用于测年目的的一些见解


在不同温度水平 （294–94 K） 下测量了石英样品的 EPR（电子顺磁共振）光谱，以不同的吸收剂量 （0–8000 Gy） 进行γ辐照。系统研究了 E1′、Ge、过氧、Al 和 Ti 中心的温度依赖性，并开发了一个现象学模型从理论上解释温度饱和现象。实验结果表明，不同顺磁中心的温度依赖性不同，主要是由于自旋晶格弛豫过程的差异。在有限的实验条件和温度范围下，无法得出关于等效剂量 （DE） 的温度依赖性的可靠结论。仿真结果表明，在较高温度下获得的 DE 值更接近于本征值，而在温度饱和区域获得的 DE 值则值得怀疑。此外，通过比较不同温度和功率水平下的光谱，提供了避免信号干扰的测量建议。在系列等分试样之间自旋晶格弛豫时间 （T1） 不一致的情况下，更精确地表征 T1 的温度依赖性对于进一步提高测年可靠性至关重要，并对相对定量 EPR 提出了挑战。