Study of thermoluminescence characteristics of quartz for high radiation doses (>1kGy): Implications for extending the luminescence dating range

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

Radiation Measurements Pub Date : 2024-09-18 DOI:10.1016/j.radmeas.2024.107300

Malika Singhal , Madhusmita Panda , S.H. Shinde , Sandip Mondal , O. Annalakshmi , Naveen Chauhan

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引用次数: 0

Abstract

Quartz is an omnipresent abundant natural mineral, used for luminescence dating. Lately, quartz optically stimulated luminescence (OSL) technique is widely used to estimate the equivalent doses (D_e) for dating geological events (up to 250 Gy, limited by saturation). Some works report thermoluminescence (TL) saturation around ∼ (10–40) kGy. Still dose estimates for such high radiation dose (HRD) range are not achieved. Significant research exists about luminescence response for low dose ranges (<250 Gy) but limited studies are done for HRDs (>1 kGy). This work characterizes the luminescence response of quartz for HRDs (1–21 kGy) to improve existing understanding of luminescence mechanism. Results show that the characteristics of the trap (<200 °C) differ significantly at HRDs than low doses. TL in multi-spectral detection (UV–Visible) band suggest an increase in 340–380 °C peak intensity up to 11 kGy dose. The measurements of saturation dose suggest that it depends on the trapping centres but is independent of recombination centres for the samples used for study. The traps are found bleachable by sunlight, reducing TL signal to residual levels in 1 h. Further, the bleachability is found to be anti-correlated with luminescence emission wavelength. At HRDs luminescence sensitivity is influenced by dose given in previous cycle which is difficult to correct by routine normalization procedures. The work also explores the various normalization methods to find appropriate method for HRD estimation and recommends the use of mass normalization as other normalization methods do not correct the sensitivity changes at HRDs adequately.

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高辐射剂量（>1kGy）石英热发光特性研究：对扩大发光测年范围的影响

石英是一种无处不在的丰富天然矿物，可用于发光测年。最近，石英光激发发光（OSL）技术被广泛用于估算地质事件年代的当量剂量（De）（最高可达 250 Gy，受饱和度限制）。一些研究报告称，热释光（TL）的饱和度约为∼ (10-40) kGy。但对这种高辐射剂量（HRD）范围的剂量估计仍未实现。关于低剂量范围（250 Gy）的发光响应已有大量研究，但针对高辐射剂量（1 kGy）的研究却十分有限。这项研究描述了石英对 HRDs（1-21 kGy）的发光响应，以加深对发光机制的理解。结果表明，与低剂量相比，HRDs 时陷阱（<200 °C）的特性有很大不同。多光谱检测（紫外-可见光）波段的 TL 表明，在 11 kGy 剂量以下，340-380 ℃ 峰值强度会增加。饱和剂量的测量结果表明，它取决于捕获中心，但与用于研究的样品的重组中心无关。此外，还发现漂白性与发光发射波长无关。在 HRDs 中，发光灵敏度受前一周期所给剂量的影响，这很难通过常规归一化程序来纠正。这项研究还探讨了各种归一化方法，以找到合适的方法来估算 HRD，并建议使用质量归一化，因为其他归一化方法不能充分纠正 HRD 的灵敏度变化。

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.