Characteristics of the quartz isothermal thermoluminescence (ITL) signal from the 375 °C peak and its potential for extending the age limit of quartz dating

IF 2.2 3区物理与天体物理 Q2 NUCLEAR SCIENCE & TECHNOLOGY

Radiation Measurements Pub Date : 2023-02-01 DOI:10.1016/j.radmeas.2022.106899

Neda Rahimzadeh , Junjie Zhang , Sumiko Tsukamoto , Hao Long

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引用次数: 0

Abstract

The quartz isothermal thermoluminescence (ITL) signal measured at 330 °C (ITL₃₃₀) has been proposed as a method to measure deep traps in quartz, i.e., 375 °C TL peak, therefore offering the potential to extend the dating limit of quartz. However, little is known about the applicability of this signal for dating. We therefore investigate the characteristics of the ITL₃₃₀ signal, in terms of the origin of the signal, thermal stability, and bleachability. Since the trapping sensitivity changes induced by high temperature treatments undermine the application of the single aliquot regenerative dose (SAR) protocol, here we evaluate the reliability and applicability of the multiple aliquot methods, i.e., multiple aliquot additive dose (MAAD) and multiple aliquot regenerative dose (MAR) protocols, using samples from the Luochuan section on the Chinese Loess Plateau with the independent age control. Results indicate that the ITL₃₃₀ signal is closely associated with the 375 °C peak of the glow curve, originating from a deep trap at about 1.8 eV with a thermal lifetime of ∼10¹⁰ years at 10 °C. The natural ITL₃₃₀ dose response curve (DRC) indicates the signal has a theoretical dating range up to ∼800 Gy, equivalent to ∼230 ka. When the natural DRC is compared with the laboratory generated DRCs using MAR and MAAD protocols, they start to diverge in shape after ∼200 Gy, resulting in significant ITL₃₃₀ age underestimation beyond ∼70 ka. However, application of the pulsed-irradiation (PI) method for the MAAD protocol reveals that the shape of the natural DRC can mostly be reproduced with the PI-MAAD protocol and thus it can provide reliable ages up to natural saturation at ∼230 ka. While further investigations are required to assess the impact of the repeated pulse irradiation and heating on the signal and determine the optimal pulsed irradiation conditions, it appears that this approach can be a promising step forward to provide a better simulation of the trapping conditions in nature.

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375℃石英等温热释光(ITL)信号特征及其延长石英定年年龄的潜力

在330℃下测量的石英等温热释光(ITL)信号(ITL330)已被提出作为测量石英深部圈闭的方法，即375℃的TL峰，因此提供了扩展石英测年极限的潜力。然而，人们对这种信号在年代测定中的适用性知之甚少。因此，我们研究了ITL330信号的特性，包括信号的来源、热稳定性和可漂白性。由于高温处理引起的捕获灵敏度变化影响了单等分再生剂量(SAR)方案的应用，本文以中国黄土高原洛川剖面为样本，在独立年龄控制条件下，评价了多重等分方法，即多重等分添加剂量(MAAD)和多重等分再生剂量(MAR)方案的可靠性和适用性。结果表明，ITL330信号与发光曲线的375°C峰密切相关，该峰起源于约1.8 eV的深阱，在10°C下的热寿命为~ 1010年。天然ITL330剂量响应曲线(DRC)表明信号的理论测年范围高达~ 800 Gy，相当于~ 230 ka。当使用MAR和MAAD协议将天然DRC与实验室生成的DRC进行比较时，它们在~ 200 Gy后开始在形状上发生分歧，导致超过~ 70 ka的ITL330年龄显着低估。然而，对MAAD协议的脉冲辐照(PI)方法的应用表明，自然DRC的形状大部分可以用PI-MAAD协议再现，因此它可以提供可靠的年龄，直到自然饱和在~ 230 ka。虽然需要进一步的研究来评估重复脉冲辐照和加热对信号的影响，并确定最佳脉冲辐照条件，但这种方法似乎可以向前迈出有希望的一步，以提供更好的模拟自然界中的捕获条件。

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.