重新审视锆石发光测年法

•  发光测年在第四纪科学中起着关键作用，然而，在改进发光方法的时间范围、准确性和精度方面，持续的方法学挑战仍然存在。我们的贡献重新审视了锆石作为石英、长石或方解石在常规测年应用中的潜在替代剂量计。与其他矿物相比，锆石的主要优势是由于高放射性核素含量而具有时间不变和高内部剂量率，这超过了更难评估的外部贡献。据报道，锆石的缺点是锆石丰度低、样品制备费力、信号不稳定、光信号重置率未知以及信号强度低。我们目前的研究使用现代发光检测设备和分析方法来研究矿物分离、矿物特性、漂白性、信号光谱和强度以及自动再生信号的潜力。我们展示了两个锆石样品的结果，这两个样品的来源、微量元素组成和发光特性不同，每个样品都含有几百颗晶粒。锆石在模拟阳光照射下的光释光 (OSL) 信号重置速度比长石快几个数量级，比石英稍慢。记录的热释光 (TL) 光谱证实了之前发表的结果，即紫外/紫光和红光波长范围内的发光，以及与镧系元素掺杂剂相关的窄带发射。对单个锆石颗粒进行 1.5 年的自动再生测量存储实验产生了非常低的 OSL 信号。同时，仅三周后，我们就以较低的漂白率为代价测量了可接受的 TL 信号强度。到目前为止，自动再生方法似乎是一种有前途且准确的锆石光照事件测定方法，尤其是将天然 OSL 与自动再生 TL 相结合时。然而，需要进一步研究以优化信号强度并将锆石确立为常规测年应用的可行目标。

— https://doi.org/10.5194/gchron-2024-10

《珠宝玉石鉴定 阴极发光图像法》 GB/T 36129-2018

•  规定了珠宝玉石鉴定中阴极发光图像法的方法原理、实验方法、结果表示

•  适用于珠宝玉石及其优化处理品的鉴定

•  不同种类的珠宝玉石或相同种类不同成因的珠宝玉石，在高能电子束酌轰击下，会产生不同波长和强度的荧光。荧光的颜色及其分布特征可以用于判断珠宝玉石如某些微量元素的种类、含量，以及结构缺陷等情况。根据阴极发光图像所显示的晶体銡构或生长纹理等特征，可以了解珠宝玉石的生长环境、生长历史等信息。

—— 起草单位：天津市产品质量监督检测技术研究院、北京桓元华建科技发展有限公司等

通过纳米级异质结构设计优化阴极发光光谱

•  在材料科学中，以纳米级空间分辨率映射埋层界面的光学响应至关重要，因为出于结构或功能原因，有源组件嵌入缓冲层中。Lawrence Berkeley 国家实验室证明阴极发光显微镜不仅是可视化埋层界面的理想工具，而且可以通过异质结构设计进行优化。

•  他们研究了在六方氮化硼层之间的半导体过渡金属二硫氧化物单层的原型系统。利用封装层来调整阴极发光映射中可实现的纳米级空间分辨率，同时控制发射亮度。较厚的封装层会产生更亮的发射，而较薄的封装层会以牺牲信号强度为代价来增强空间分辨率。在总封装约 ∼100 nm 时，可以实现亮度和分辨率之间的良好平衡。还可以通过使用光谱不同的信号来克服激子扩散的空间分辨率。

TL and OSL as research tools in luminescence: Possibilities and limitations

•  In the absence of concrete experimental evidence, it is time to abandon the use of general-order kinetics for the analysis of TL and OSL processes. Since the early work by Randall and Wilkins, Garlick and Gibson and May and Partridge, experimental evidence for non-first-order kinetics has been scarse and the many warnings against applying the various analysis techniques in the presence of more than one process (overlapping TL peaks) were largely unheeded. Although the theoretical work on the possible behaviors of the systems based on various assumptions remain valid, application of non-first-order kinetics to experimental data, including peak fitting with the general order model, has for the most part been a journey leading nowhere. Experimental evidence accumulated over decades largely supports the predominance of first-order behavior, either because of the multitude of recombination or other trapping pathways competing with the retrapping route, or due to the predominance of monomolecular recombination within a trap/recombination center cluster.

Models based on the numerical solution of rate equations for a system with finite number of trapping centers have been relevant to understand the behavior of TL and OSL systems under various conditions. Such models, however, are of limited value when used only to explain a small dataset and not to simultaneously explain a variety of experimental observations, as highlighted by Horowitz et al.

Nevertheless, valuable insights into the TL and OSL processes have been obtained by considering more realistic models for the processes, including the possibility of tunneling, localized transitions, and distribution of activation energies, overwhelmingly based on first-order processes. Such investigations have led to interesting explanations for the trap structures in scintillators, models for the trap distributions in particle temperature sensors, glasses of interest in accident dosimetry and persistent phosphors. The rapid increase in computation power has allowed a faster and more through comparison between the predictions of a model and various experimental results, thereby potentially improving the reliability of the results.

— Eduardo Gardenali Yukihara, TL and OSL as research tools in luminescence: Possibilities and limitations, Ceramics International

Volume 49, Issue 14, Part B, 15 July 2023, Pages 24356-24369