Sodium borate glass for radiation Dosimetry: Correlating Thermoluminescence emission with optical and EPR characterization

IF 3.6 3区物理与天体物理 Q2 OPTICS

Journal of Luminescence Pub Date : 2025-08-28 DOI:10.1016/j.jlumin.2025.121505

Caroline Paschoal Fernandes , Rene Rojas Rocca , Georgios S. Polymeris , Nilo Francisco Cano , Lilia Coronato Courrol , Sonia Hatsue Tatumi

{"title":"Sodium borate glass for radiation Dosimetry: Correlating Thermoluminescence emission with optical and EPR characterization","authors":"Caroline Paschoal Fernandes , Rene Rojas Rocca , Georgios S. Polymeris , Nilo Francisco Cano , Lilia Coronato Courrol , Sonia Hatsue Tatumi","doi":"10.1016/j.jlumin.2025.121505","DOIUrl":null,"url":null,"abstract":"<div><div>Sodium borate (SB) glass was investigated as a potential material for thermoluminescent (TL) dosimetry. The TL emission is mainly concentrated in the ultraviolet region (250–400 nm), with glow peaks between 80 °C and 200 °C. The dose–response is linear from 2 to 1000 Gy, and the minimum detectable dose (MDD) is 58 mGy under standard conditions. To improve signal stability, a preheat step was introduced before TL readout, effectively removing unstable low-temperature components. Under this new condition, the MDD was revised to 160 mGy, and repeatability improved, with a reduced deviation of 4 %. Fading stabilized within 30 min, with only 3 % signal loss. Optical bleaching experiments revealed a gradual TL intensity reduction under blue light exposure, indicating the presence of optically sensitive traps. Electron paramagnetic resonance (EPR) analysis identified two defect centers induced by γ-irradiation. Among them, a center showing four-line hyperfine splitting was assigned to a boron-oxygen hole center (BOHC) and is associated with the TL peak at 155 °C, while another was attributed to an F<sup>+</sup> center (peak at 288 °C), corresponding to a singly ionized oxygen vacancy. These results support the suitability of SB glass for high dose TL dosimetry applications.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"287 ","pages":"Article 121505"},"PeriodicalIF":3.6000,"publicationDate":"2025-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Luminescence","FirstCategoryId":"101","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0022231325004454","RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"OPTICS","Score":null,"Total":0}

引用次数: 0

Abstract

Sodium borate (SB) glass was investigated as a potential material for thermoluminescent (TL) dosimetry. The TL emission is mainly concentrated in the ultraviolet region (250–400 nm), with glow peaks between 80 °C and 200 °C. The dose–response is linear from 2 to 1000 Gy, and the minimum detectable dose (MDD) is 58 mGy under standard conditions. To improve signal stability, a preheat step was introduced before TL readout, effectively removing unstable low-temperature components. Under this new condition, the MDD was revised to 160 mGy, and repeatability improved, with a reduced deviation of 4 %. Fading stabilized within 30 min, with only 3 % signal loss. Optical bleaching experiments revealed a gradual TL intensity reduction under blue light exposure, indicating the presence of optically sensitive traps. Electron paramagnetic resonance (EPR) analysis identified two defect centers induced by γ-irradiation. Among them, a center showing four-line hyperfine splitting was assigned to a boron-oxygen hole center (BOHC) and is associated with the TL peak at 155 °C, while another was attributed to an F⁺ center (peak at 288 °C), corresponding to a singly ionized oxygen vacancy. These results support the suitability of SB glass for high dose TL dosimetry applications.

查看原文本刊更多论文

辐射剂量测定用硼酸钠玻璃：与光学和EPR特性相关的热释光发射

研究了硼酸钠（SB）玻璃作为热释光（TL）剂量测定的潜在材料。TL发射主要集中在250 ~ 400 nm的紫外区，发光峰在80 ~ 200℃之间。剂量响应在2 ~ 1000 Gy范围内呈线性，在标准条件下最小可检测剂量（MDD）为58 mGy。为了提高信号稳定性，在TL读出前引入预热步骤，有效去除不稳定的低温组分。在这种新条件下，MDD修正为160 mGy，可重复性提高，偏差降低了4%。衰落在30分钟内稳定，只有3%的信号损失。光学漂白实验显示，在蓝光照射下，TL强度逐渐降低，表明存在光敏感陷阱。电子顺磁共振（EPR）分析发现了两个由γ辐照引起的缺陷中心。其中，一个具有四线超细分裂的中心归属于硼氧空穴中心（BOHC），与155°C的TL峰有关，另一个归属于F+中心（峰在288°C），与单电离氧空位有关。这些结果支持SB玻璃用于高剂量TL剂量测定的适用性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Journal of Luminescence 物理-光学

CiteScore

6.70

自引率

13.90%

发文量

850

审稿时长

3.8 months

期刊介绍： The purpose of the Journal of Luminescence is to provide a means of communication between scientists in different disciplines who share a common interest in the electronic excited states of molecular, ionic and covalent systems, whether crystalline, amorphous, or liquid. We invite original papers and reviews on such subjects as: exciton and polariton dynamics, dynamics of localized excited states, energy and charge transport in ordered and disordered systems, radiative and non-radiative recombination, relaxation processes, vibronic interactions in electronic excited states, photochemistry in condensed systems, excited state resonance, double resonance, spin dynamics, selective excitation spectroscopy, hole burning, coherent processes in excited states, (e.g. coherent optical transients, photon echoes, transient gratings), multiphoton processes, optical bistability, photochromism, and new techniques for the study of excited states. This list is not intended to be exhaustive. Papers in the traditional areas of optical spectroscopy (absorption, MCD, luminescence, Raman scattering) are welcome. Papers on applications (phosphors, scintillators, electro- and cathodo-luminescence, radiography, bioimaging, solar energy, energy conversion, etc.) are also welcome if they present results of scientific, rather than only technological interest. However, papers containing purely theoretical results, not related to phenomena in the excited states, as well as papers using luminescence spectroscopy to perform routine analytical chemistry or biochemistry procedures, are outside the scope of the journal. Some exceptions will be possible at the discretion of the editors.