微波功率对 ESR 测定中当量剂量 (De) 评估的影响

IF 1.6 3区物理与天体物理 Q2 NUCLEAR SCIENCE & TECHNOLOGY Radiation Measurements Pub Date : 2024-07-10 DOI:10.1016/j.radmeas.2024.107231

Shuchen Wang , Zhenlin Jia , Hongshan Gao , Desheng Xue , Baotian Pan

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引用次数: 0

摘要

在不同的微波功率水平（0-200 mW）下，测量了不同伽马（γ）剂量辐照下石英样品的ESR（电子自旋共振）光谱。系统研究了Al中心和E′中心的微波功率饱和特性，揭示了功率饱和特性对ESR测年中等效剂量（De）拟合结果的影响机制。实验结果表明，辐照会缩短自旋晶格弛豫时间，导致 ESR 强度呈现显著饱和时，无法从本质上确定一系列等分样品中的自旋数量。模拟结果表明，自旋晶格弛豫特性的变化会导致剂量反应曲线（DRC）在高功率水平下发生扭曲，从而导致 De 值出现偏差。我们提出了一种使用功率饱和曲线（PSC）近似线性机制的斜率作为 ESR 强度内在指标的方法；该方法已在实验和模拟中得到初步验证。

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Impact of microwave power on equivalent dose (De) evaluation in ESR dating

ESR (electron spin resonance) spectra of quartz samples irradiated with varying gamma ( $γ$ ) dose were measured at different microwave power levels (0–200 mW). The microwave power saturation characteristics of Al and E $^{'}$ centers were systematically investigated, and the mechanisms by which the power saturation characteristics affected equivalent dose ( $D_{e}$ ) fitting results in ESR dating were revealed. The experimental results demonstrated that irradiation reduces the spin-lattice relaxation time, resulting in the inability to intrinsically characterize the number of spins in a series of aliquots when the ESR intensity exhibits significant saturation. The simulation results indicated that changes in spin-lattice relaxation characteristics can cause distortion in the dose response curve (DRC) at high power levels, leading to deviations in $D_{e}$ values. A method that uses the slope of the approximate linear regime of the power saturation curve (PSC) as an intrinsic metric of ESR intensity is proposed; this method has been preliminarily validated in both experiments and simulations.

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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.