Thermal stability of the bleachable and unbleachable components of the ESR signals in sedimentary quartz

IF 1.6 3区物理与天体物理 Q2 NUCLEAR SCIENCE & TECHNOLOGY

Radiation Measurements Pub Date : 2024-11-07 DOI:10.1016/j.radmeas.2024.107327

Naoya Obata , Shin Toyoda

引用次数: 0

Abstract

The thermal stability of the bleachable and unbleachable components of the electron spin resonance signals in quartz grains from modern fluvial sediments were investigated. It was found that the unbleachable Al center is thermally more stable than the bleachable component, hence the unbleachable component can be extracted by heating. Protocols for equivalent dose evaluation with preheating are proposed, in which the procedure of bleaching is replaced by “partial annealing” (heating at 280 °C for 15 min) for the Al center and by “annealing” (heating at 400 °C for 1 h) for the Ti-Li and Ti-H centers. The dose recovery test confirmed that the proposed protocol works practically, and that the regenerative protocol is better than the additive dose protocol in the aspect of the statistical errors. Appropriate partial annealing conditions to extract the unbleachable Al centers may need to be investigated for each sample.

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沉积石英中 ESR 信号的可漂和不可漂成分的热稳定性

研究了现代河流沉积物中石英颗粒电子自旋共振信号中可漂白和不可漂白成分的热稳定性。研究发现，不可漂白的铝中心的热稳定性高于可漂白成分，因此可通过加热提取不可漂白成分。提出了预热等效剂量评估方案，其中铝中心用 "部分退火"（在 280 °C 下加热 15 分钟）代替漂白过程，钛-锂和钛-氢中心用 "退火"（在 400 °C 下加热 1 小时）代替漂白过程。剂量恢复试验证实，所建议的方案切实可行，而且在统计误差方面，再生方案优于加剂量方案。为提取不可漂白的铝中心，可能需要针对每个样品研究适当的部分退火条件。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Radiation Measurements 工程技术-核科学技术

CiteScore

4.10

自引率

20.00%

发文量

116

审稿时长

48 days

期刊介绍： The journal seeks to publish papers that present advances in the following areas: spontaneous and stimulated luminescence (including scintillating materials, thermoluminescence, and optically stimulated luminescence); electron spin resonance of natural and synthetic materials; the physics, design and performance of radiation measurements (including computational modelling such as electronic transport simulations); the novel basic aspects of radiation measurement in medical physics. Studies of energy-transfer phenomena, track physics and microdosimetry are also of interest to the journal. Applications relevant to the journal, particularly where they present novel detection techniques, novel analytical approaches or novel materials, include: personal dosimetry (including dosimetric quantities, active/electronic and passive monitoring techniques for photon, neutron and charged-particle exposures); environmental dosimetry (including methodological advances and predictive models related to radon, but generally excluding local survey results of radon where the main aim is to establish the radiation risk to populations); cosmic and high-energy radiation measurements (including dosimetry, space radiation effects, and single event upsets); dosimetry-based archaeological and Quaternary dating; dosimetry-based approaches to thermochronometry; accident and retrospective dosimetry (including activation detectors), and dosimetry and measurements related to medical applications.