About thermal stability of the F+ centers in MgO single crystals irradiated by fast neutrons or energetic Ar ions

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

Radiation Measurements Pub Date : 2024-11-14 DOI:10.1016/j.radmeas.2024.107335

Guldar Baubekova , Ruslan Assylbayev , Alise Podelinska , Viktor Seeman , Evgeni Shablonin , Evgeni Vasil'chenko , Aleksandr Lushchik

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引用次数: 0

Abstract

Single crystals of MgO have been exposed to 70-MeV argon ions with varying fluence of 4 × 10¹²-3 × 10¹⁴ cm⁻². The dependence of radiation-induced optical absorption (RIOA) at 1.7–6.5 eV on irradiation fluence has been analyzed. The EPR signal of the F⁺ center in ion-irradiated crystal has been detected and via the EPR parameters proved to be the same as in well-studied neutron-irradiated MgO crystals. The precise isothermal annealing of the F ⁺ EPR signal has been performed for the first time in a temperature range of 400–1100 K for both a fast neutron irradiated (2.7 × 10¹⁸ cm⁻²) and Ar-irradiated (3 × 10¹⁴ cm⁻²) MgO crystals. In both cases, the F ⁺ EPR decay starts only above 700 K and ends at 950–1060 K, depending on irradiation type. Using the same stepwise annealing procedure, the changes in RIOA for ion-irradiated samples have also been analyzed and possible reasons for the discrepancy in the thermal behaviour of optical and EPR F ⁺ -absorption have been considered.

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关于快中子或高能氩离子照射下氧化镁单晶中 F+ 中心的热稳定性

氧化镁单晶体受到了 70-MeV 氩离子 4 × 1012-3 × 1014 cm-2 的不同辐照。分析了 1.7-6.5 eV 处辐射诱导光吸收（RIOA）与辐照通量的关系。在离子辐照晶体中检测到了 F+ 中心的 EPR 信号，并通过 EPR 参数证明其与经过充分研究的中子辐照氧化镁晶体相同。对于快中子辐照（2.7 × 1018 cm-2）和氩辐照（3 × 1014 cm-2）的氧化镁晶体，首次在 400-1100 K 的温度范围内对 F + EPR 信号进行了精确的等温退火处理。在这两种情况下，根据辐照类型的不同，F + EPR 衰变仅在 700 K 以上开始，在 950-1060 K 结束。使用相同的逐步退火程序，还分析了离子辐照样品的 RIOA 变化，并考虑了光学和 EPR F + - 吸收热行为差异的可能原因。

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.