Radiation Measurements最新文献_第2页

Preliminary ESR dating results of fault barite shed new insights into the retrospective history of bedrock fault activities in basaltic regions 断层重晶石的初步 ESR 测定结果为了解玄武岩地区基岩断层活动的追溯历史提供了新的视角

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

Radiation Measurements

Pub Date : 2024-10-04 DOI: 10.1016/j.radmeas.2024.107306

Chuanyi Wei , Gongming Yin , Yongsheng Zhou , Chunru Liu , Li Cheng , Xi Ma , Hao Ji , Jiaxiang Dang

The chronology of fault activity in bedrock is critical to constraining and understanding periods of active faulting, assessing seismic hazards, and mitigating the effects of earthquakes. However, because of the lack of suitable materials for dating, the temporal reconstruction of faulting in bedrock remains highly challenging for geologists. In the present study, we determine for the first time the electron spin resonance (ESR) ages of fault barite (BaSO₄), which is produced by episodes of intense faulting on basalt bedrock fault surfaces. Three barite samples were obtained from a basalt fault section (27°5′23″N, 100°25′45″E, 1.8 km above sea level) of the Lijiang–Xiaojinhe Fault (LXF), southeastern Tibetan Plateau, for ESR measurements. Similar to marine barite, the ESR spectrum of fault barite shows an electron-type center with g = 2.0037, 2.0034, and 2.0028 attributed to SO₃⁻. The signal intensity systematically increased with increasing gamma-ray dose. Dose rates were calculated using a model based on the location and burial depth of the barite samples, as well as their surrounding bedrock. The three barite samples yield ESR ages of 131 ± 26, 503 ± 61, and 1416 ± 246 ka, respectively, which indicate that the LXF was active during the Early and Middle Pleistocene. The three ESR ages for fault barite from basalt extend the time range of activity of the LXF compared with previous carbonate ESR and radiocarbon dating results. Consequently, we propose that ESR dating of barite is valuable for reconstructing the history of bedrock fault activity. However, given that this investigation represents a preliminary application of the fault-barite ESR method, further study is needed to confirm its usefulness and the accuracy and precision of dating results.

基岩中断层活动的年代学对于限制和了解活跃断层期、评估地震危害和减轻地震影响至关重要。然而，由于缺乏合适的测年材料，基岩断层的时间重建对地质学家来说仍然极具挑战性。在本研究中，我们首次测定了断层重晶石（BaSO4）的电子自旋共振（ESR）年龄。研究人员从青藏高原东南部丽江-小金河断层（LXF）的玄武岩断层断面（北纬 27°5′23″，东经 100°25′45″，海拔 1.8 千米）采集了三个重晶石样品进行 ESR 测量。与海相重晶石相似，断层重晶石的 ESR 光谱显示出一个电子型中心，其 g = 2.0037、2.0034 和 2.0028 分别归因于 SO3-。信号强度随着伽马射线剂量的增加而系统地增加。剂量率是根据重晶石样品的位置和埋藏深度以及周围基岩的情况计算出来的。三个重晶石样本的ESR年龄分别为131±26、503±61和1416±246 ka，表明LXF在早更新世和中更新世期间十分活跃。与之前的碳酸盐ESR和放射性碳测年结果相比，玄武岩中断层重晶石的三个ESR年龄扩大了LXF的活动时间范围。因此，我们认为重晶石的 ESR 年代测定对于重建基岩断层活动的历史具有重要价值。不过，鉴于本次调查是对断层-重晶石 ESR 方法的初步应用，还需要进一步的研究来确认其实用性以及测年结果的准确性和精确性。

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引用次数: 0

Characterization of a real time dosimetry system using 2D nano and micro-coatings in proton and carbon therapeutic ion beams 在质子和碳治疗离子束中使用二维纳米和微涂层的实时剂量测定系统的特性分析

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

Radiation Measurements

Pub Date : 2024-09-27 DOI: 10.1016/j.radmeas.2024.107303

Luana de Freitas Nascimento , Marijke De Saint-Hubert , Marco Caprioli , Laurence Delombaerde , Katleen Himschoot , Dirk Vandenbroucke , Paul Leblans , Wouter Crijns , Satoshi Kodaira

Real-time radioluminescence two-dimensional coatings have potential as dosemeters in proton and carbon therapeutic beams. We investigated coatings made of nano and micro-(C₄₄H₃₈P₂)MnCl₄ and (C₃₈H₃₆P₂)MnBr₄ crystals mixed with a water-equivalent substrate. The response of the radioluminescence signal of the coatings along the Bragg curves presented an ionization quenching effect, but less prominent than what has been observed in our previous works using Al₂O₃:X (X = C and C,Mg) coatings. We hypothesize that this results from their lower crystal sizes and effective atomic number (Z_eff). Combined experimental results and Monte Carlo simulations resulted in correction factors to address the linear energy transfer dependence and restore the constant response for particle therapy beams. The quenching correction method was applied to the studied proton and carbon ion beams and yielded the best results for the nano-(C₄₄H₃₈P₂)MnCl_4, coating, followed by the micro-(C₄₄H₃₈P₂)MnCl₄, nano-(C₃₈H₃₆P₂)MnBr₄, and micro-(C₃₈H₃₆P₂)MnBr₄.

实时放射发光二维涂层具有作为质子和碳治疗束剂量计的潜力。我们研究了由纳米和微米-(C44H38P2)氯化锰和(C38H36P2)溴化锰晶体与水等效基质混合制成的涂层。涂层的辐射发光信号沿布拉格曲线的响应呈现出电离淬灭效应，但没有我们之前使用 Al2O3:X（X = C 和 C,Mg）涂层时观察到的效应那么突出。我们推测这是由于它们的晶体尺寸和有效原子序数（Zeff）较低造成的。结合实验结果和蒙特卡洛模拟，我们得出了修正系数，以解决线性能量转移依赖性问题，并恢复粒子治疗光束的恒定响应。淬火修正法适用于所研究的质子和碳离子束，对纳米（C44H38P2）氯化锰涂层的效果最好，其次是微量（C44H38P2）氯化锰、纳米（C38H36P2）溴化锰和微量（C38H36P2）溴化锰。

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引用次数: 0

High-sensitivity ferrous sulfate dosimeters with wide dosimetry range based on fluorescence properties of gold nanoclusters 基于纳米金簇荧光特性的高灵敏度、宽剂量测定范围的硫酸亚铁剂量计

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

Radiation Measurements

Pub Date : 2024-09-23 DOI: 10.1016/j.radmeas.2024.107304

Yu Chen, Shuquan Chang, Xiaodan Hu, Xiaohong Zhang, Haiqian Zhang

With the widespread application of nuclear technologies, radiation dose measurement is important. Ferrous sulfate dosimeters are common chemical dosimeters, but their high detection limit and narrow dosimetry range limit their application in some fields. In this work, we introduce a novel dosimetry approach for ferrous sulfate dosimeters utilizing the fluorescence properties of gold nanoclusters (AuNCs) capped with histidine. The Fe²⁺ ions in the ferrous sulfate dosimeter are oxidized to Fe³⁺ ions during irradiation. The presence of Fe³⁺ ions results in the fluorescence quenching of AuNCs, establishing a correlation between the fluorescence intensity of the dosimeter and irradiation doses. The lowest detection limit of the fluorescence dosimeter was found to be 2 Gy. Moreover, the dose response of the dosimeter showed good linearity within the dose range of 2–400 Gy. The dosimetric sensitivity of the fluorescence dosimeter was 17.9% higher than that of ultraviolet–visible spectroscopy. The results indicate that the dosimetry method utilizing the fluorescence properties of AuNCs significantly improves the detection sensitivity and detection limit of the dosimeter. Our work provides a new dosimetry method for ferrous sulfate dosimeters that can be used in a wider range of irradiation situations.

随着核技术的广泛应用，辐射剂量的测量非常重要。硫酸亚铁剂量计是常见的化学剂量计，但其检测限高、剂量测定范围窄，限制了其在某些领域的应用。在这项工作中，我们利用组氨酸封端的金纳米团簇（AuNCs）的荧光特性，为硫酸亚铁剂量计引入了一种新的剂量测定方法。硫酸亚铁剂量计中的 Fe2+ 离子在辐照过程中被氧化成 Fe3+ 离子。Fe3+ 离子的存在导致 AuNCs 的荧光淬灭，从而建立了剂量计荧光强度与辐照剂量之间的相关性。荧光剂量计的最低检测限为 2 Gy。此外，剂量计的剂量响应在 2-400 Gy 的剂量范围内显示出良好的线性。荧光剂量计的剂量灵敏度比紫外可见光谱法高 17.9%。结果表明，利用 AuNCs 的荧光特性进行剂量测定的方法大大提高了剂量计的检测灵敏度和检测限。我们的工作为硫酸亚铁剂量计提供了一种新的剂量测定方法，可用于更广泛的辐照场合。

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引用次数: 0

Implementation and optimisation of cosmic veto system using digital electronics in an environmental gamma-spectrometry laboratory 在环境伽马能谱仪实验室利用数字电子技术实施和优化宇宙否决系统

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

Radiation Measurements

Pub Date : 2024-09-20 DOI: 10.1016/j.radmeas.2024.107302

Luka Bakrač , Tomislav Ilievski , Nikola Marković , Damir Bosnar , Ivana Tucaković

This paper presents a detailed description of construction and introduction of an assembly for cosmic veto system at the Laboratory for radioecology of the Ruđer Bošković Institute in Zagreb. It is a typical surface laboratory for environmental radioactivity measurements using HPGe detectors. In surface level laboratories a large part of the background signal is caused by radiation produced by cosmic radiation, mostly by muons. It leads to limiting factors for reaching low detection limits, essential in environmental sample measurements, where relatively low activity concentrations are expected. Thus, reduction of cosmic component of background becomes a requirement, but also a challenge and an expense for already set routine gamma spectrometric laboratories. This paper offers a detailed description of materials and steps needed for construction and implementation of such an assembly as a guideline for other laboratories. The homebuilt veto system presented here is based on large scintillator plates covering the existing passive lead shielding. For the easy and rapid characterization of the veto system, a newly acquired digitizer was used. More specifically, the timestamping capabilities of the CAEN DT5781 MCA were used to identify the coincidences caused by muons between the scintillators and the HPGe. With the 3 plates added, a reduction factor of 2.4 was achieved, reducing the count rate between 40 keV and 2700 keV from 0.58 cps to 0.27 cps. After the full characterization of the veto system, the setup was transferred back to the previously used Canberra DSA, more suitable for routine measurements. This step and its description are lacking in the existing literature, while it is very valuable for the laboratories already set up for the environmental measurement. The additional advantages of a homebuilt system are the modularity and multi-purpose of the system which can later be used for different applications.

本文详细介绍了萨格勒布鲁杰尔-博什科维奇研究所放射生态学实验室宇宙否决系统组件的建造和引进情况。这是一个使用 HPGe 探测器进行环境放射性测量的典型地面实验室。在地表实验室中，很大一部分本底信号是由宇宙辐射（主要是μ介子）产生的。这导致了达到低检测限的限制因素，而低检测限对于环境样品测量是至关重要的，因为环境样品的放射性浓度相对较低。因此，减少本底中的宇宙成分就成了一项要求，同时也是一项挑战，对已经建立的常规伽马能谱实验室来说也是一笔开支。本文详细介绍了建造和实施这种装置所需的材料和步骤，为其他实验室提供指导。本文介绍的自制否决系统是以覆盖现有被动铅屏蔽的大型闪烁板为基础的。为了简便快速地鉴定否决系统，使用了新购置的数字转换器。更具体地说，CAEN DT5781 MCA 的时间戳功能被用来识别闪烁体和 HPGe 之间μ介子引起的重合。由于增加了 3 块板，减少系数达到了 2.4，使 40 keV 至 2700 keV 之间的计数率从 0.58 cps 降至 0.27 cps。在对否决系统进行全面鉴定之后，该装置被转回先前使用的堪培拉 DSA，因为它更适合常规测量。现有文献中缺乏对这一步骤及其说明的介绍，而这一步骤对于已经建立的环境测量实验室来说非常有价值。自制系统的额外优势在于系统的模块化和多用途性，日后可用于不同的应用领域。

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引用次数: 0

Single-photon elimination in liquid scintillation counting with pulse shape discrimination and delayed coincidence 利用脉冲形状判别和延迟重合在液体闪烁计数中消除单光子

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

Radiation Measurements

Pub Date : 2024-09-20 DOI: 10.1016/j.radmeas.2024.107299

Pengpeng Zhang , Deyuan Li , Hui Li , Hui Zhang , Xuanru Zhang , Yan Ma , Linjing Wang , Hua Li , Xuewen Yan

Liquid scintillation counting is widely used in the rapid measurement of beta activity in environmental and biological samples. However, the single-photons generated by chemiluminescence and photoluminescence in liquid scintillation cocktails seriously affect the measurement accuracy of low-energy beta activity. A novel method based on the combination of the signal characteristic analysis and selective gate to eliminate the single-photon signal was developed. A preprocessing circuit made of a fast response time photomultiplier tube (PMT, Hamamatsu R9420), two charge-sensitive preamplifiers (CSP), two comparators, an analog switch and delay-line devices were designed and developed to verify the feasibility and effectiveness. The output signals from the last dynode were characterized in the pulse time and were used to discriminate the beta signals from the single-photon ones. The beta signals were “tagged” through pulse width detection, pulse width-amplitude transform and pulse-height discrimination with the first comparator, the first CSP and the second comparator. The “tagged” beta signal were applied to control the analog switch. The anode signals were specially delayed and then selected by the analog switch to achieve the single-photon signal elimination. Liquid scintillation cocktails containing

^{14} C

or NaOH used as beta or single-photon sources were provided to verify the feasibility of the principle. The results showed that the typical fall time of the single-photon and beta signal was 16.05 ns and 43.17 ns. The single-photon rejection ratio is 2.76 × 10

^{- 3}

± 3.89 × 10

^{- 5}

, and the detection efficiency is up to

93.02 % \pm 0.59 %

.

液体闪烁计数被广泛用于快速测量环境和生物样品中的β活度。然而，液体闪烁鸡尾酒中化学发光和光致发光产生的单光子严重影响了低能贝塔活度的测量精度。研究人员开发了一种基于信号特征分析和选择性门相结合的消除单光子信号的新方法。为了验证这种方法的可行性和有效性，我们设计并开发了一个由快速响应时间光电倍增管（PMT，滨松 R9420）、两个电荷敏感前置放大器（CSP）、两个比较器、一个模拟开关和延迟线器件组成的预处理电路。最后一个 dynode 的输出信号具有脉冲时间特征，用于从单光子信号中分辨出贝塔信号。通过第一个比较器、第一个 CSP 和第二个比较器的脉宽检测、脉宽-脉幅变换和脉高分辨，对贝塔信号进行 "标记"。标记 "的贝塔信号用于控制模拟开关。阳极信号经过特殊延迟后由模拟开关选择，以实现单光子信号消除。为了验证该原理的可行性，我们提供了含有 14C 或 NaOH 的液体闪烁鸡尾酒作为贝塔源或单光子源。结果表明，单光子和贝塔信号的典型下降时间分别为 16.05 ns 和 43.17 ns。单光子抑制比为 2.76 × 10-3 ± 3.89 × 10-5，探测效率高达 93.02%±0.59%。

{"title":"Single-photon elimination in liquid scintillation counting with pulse shape discrimination and delayed coincidence","authors":"Pengpeng Zhang , Deyuan Li , Hui Li , Hui Zhang , Xuanru Zhang , Yan Ma , Linjing Wang , Hua Li , Xuewen Yan","doi":"10.1016/j.radmeas.2024.107299","DOIUrl":"10.1016/j.radmeas.2024.107299","url":null,"abstract":"<div><div>Liquid scintillation counting is widely used in the rapid measurement of beta activity in environmental and biological samples. However, the single-photons generated by chemiluminescence and photoluminescence in liquid scintillation cocktails seriously affect the measurement accuracy of low-energy beta activity. A novel method based on the combination of the signal characteristic analysis and selective gate to eliminate the single-photon signal was developed. A preprocessing circuit made of a fast response time photomultiplier tube (PMT, Hamamatsu R9420), two charge-sensitive preamplifiers (CSP), two comparators, an analog switch and delay-line devices were designed and developed to verify the feasibility and effectiveness. The output signals from the last dynode were characterized in the pulse time and were used to discriminate the beta signals from the single-photon ones. The beta signals were “tagged” through pulse width detection, pulse width-amplitude transform and pulse-height discrimination with the first comparator, the first CSP and the second comparator. The “tagged” beta signal were applied to control the analog switch. The anode signals were specially delayed and then selected by the analog switch to achieve the single-photon signal elimination. Liquid scintillation cocktails containing <span><math><mrow><msup><mrow></mrow><mrow><mn>14</mn></mrow></msup><mi>C</mi></mrow></math></span> or NaOH used as beta or single-photon sources were provided to verify the feasibility of the principle. The results showed that the typical fall time of the single-photon and beta signal was 16.05ns and 43.17ns. The single-photon rejection ratio is 2.76 × 10<span><math><msup><mrow></mrow><mrow><mo>−</mo><mn>3</mn></mrow></msup></math></span> ± 3.89 × 10<span><math><msup><mrow></mrow><mrow><mo>−</mo><mn>5</mn></mrow></msup></math></span>, and the detection efficiency is up to <span><math><mrow><mn>93</mn><mo>.</mo><mn>02</mn><mtext>%</mtext><mo>±</mo><mn>0</mn><mo>.</mo><mn>59</mn><mtext>%</mtext></mrow></math></span>.</div></div>","PeriodicalId":21055,"journal":{"name":"Radiation Measurements","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2024-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142312632","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

3D printed microcrystalline CsI:Tl composite scintillating thin films for X-ray imaging 用于 X 射线成像的 3D 打印微晶 CsI:Tl 复合闪烁薄膜

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

Radiation Measurements

Pub Date : 2024-09-19 DOI: 10.1016/j.radmeas.2024.107301

Divya Pandya , Nisha Oad , Sheetal Rawat , Brijesh Tripathi , Pavan Gurrala , Partha Sarathi Sarkar , Mohit Tyagi , Apoorva Bhatt

The utilization of additive manufacturing techniques, especially Digital Light Printing (DLP), in fabricating CsI:Tl scintillator films demonstrates considerable potential for streamlining the production of scintillators tailored for X-ray imaging applications. This research focuses on the fabrication of CsI:Tl-based composite plastic scintillator thin films. In this study, circular films measuring 1-inch in diameter and 0.1 mm & 0.2 mm in thickness are being produced and tested for gamma photon counts under alpha and gamma radiation. To establish the stopping power range of the films, a Monte Carlo based GEANT4 simulation has been carried out. Additionally, investigations into their suitability for X-ray imaging applications are being conducted, revealing the spatial resolution of the films (0.2 and 0.1 mm) between 100 and 130 μm and 1.26 lp/mm with a contrast range of 4.0–12.3 %. The observed decrease in spatial resolution and contrast for the 0.2 mm thick film is attributed to the thickness increase exacerbating the scattering phenomenon while simultaneously enhancing the X-ray stopping power. This highlights the significance of inherent trade-off between maximizing spatial resolution and compromising light yield of 0.1 mm films compared to the 0.2 mm thick film. By utilizing 3D printing, this approach offers a cost-effective and time-efficient method for producing thin-film scintillators with enhanced flexibility and customization options compared to conventional methods.

利用增材制造技术，特别是数字光打印（DLP）技术来制造铯钛闪烁体薄膜，对于简化 X 射线成像应用闪烁体的生产具有相当大的潜力。本研究的重点是铯钛基复合塑料闪烁体薄膜的制造。在这项研究中，我们制作了直径为 1 英寸、直径为 0.1 毫米、厚度为 0.2 毫米的圆形薄膜，并在阿尔法和伽马射线辐射下进行了伽马光子计数测试。为了确定薄膜的阻挡功率范围，我们进行了基于蒙特卡罗的 GEANT4 模拟。此外，还对薄膜在 X 射线成像应用中的适用性进行了研究，结果显示薄膜（0.2 和 0.1 毫米）的空间分辨率在 100 和 130 μm 之间，对比度范围为 4.0-12.3 %，对比度为 1.26 lp/mm。观察到 0.2 毫米厚薄膜的空间分辨率和对比度下降，这是因为厚度增加加剧了散射现象，同时增强了 X 射线阻挡能力。这突出表明，与 0.2 毫米厚的薄膜相比，0.1 毫米厚的薄膜在最大限度提高空间分辨率和降低光产率之间的内在权衡意义重大。通过利用三维打印技术，这种方法为生产薄膜闪烁体提供了一种具有成本效益和时间效率的方法，与传统方法相比，它具有更高的灵活性和定制选项。

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引用次数: 0

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

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

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.

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。

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引用次数: 0

Microdosimetry for BNCT: First measurements at different site sizes 用于 BNCT 的显微模拟技术：不同部位尺寸的首次测量

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

Radiation Measurements

Pub Date : 2024-09-14 DOI: 10.1016/j.radmeas.2024.107298

A. Selva, A. Bianchi, L. Bellan, E. Fagotti, A. Pisent, V. Conte

Microdosimetric techniques are a valuable tool for beam quality monitoring in BNCT, due to their capability to distinguish different contributions to the total dose and provide physics-based quantities related to biological effectiveness of this composite radiation field. To this aim, measurements are generally performed with gas detectors simulating a tissue-equivalent site size between 0.5 and 2 μm. This work presents instead measurements for site sizes up to 10 μm, performed in the thermal neutron field produced by the accelerator-based MUNES source available at INFN-LNL. An avalanche-confinement TEPC with boron doping in the cathode walls was used. Photon and neutron dose fractions were discriminated in the measured dose-weighted distributions based on their different lineal energy range. In the neutron component two separate peaks could be distinguished for site sizes of 5 μm and greater, the origin of which was tentatively related to contributions due to protons and alpha particles. These results allow to assess the impact of increasing site diameter on the measured relative dose contributions and provide valuable reference data for biological modelling and for comparison with solid-state microdosimeters.

微剂量测定技术是监测 BNCT 射束质量的重要工具，因为它能够区分对总剂量的不同贡献，并提供与这种复合辐射场的生物有效性有关的物理量。为此，通常使用气体探测器模拟 0.5 至 2 μm 的组织等效部位进行测量。这项工作介绍的是在 INFN-LNL 的 MUNES 加速器源产生的热中子场中对最大 10 μm 的位点尺寸进行的测量。使用的是阴极壁中掺有硼的雪崩抵消 TEPC。在测量的剂量加权分布中，根据不同的线能量范围对光子和中子剂量分数进行了区分。在中子分量中，5 μm 或更大的位点尺寸可区分出两个单独的峰值，其来源初步与质子和阿尔法粒子的贡献有关。通过这些结果，可以评估点直径增大对所测相对剂量贡献的影响，并为生物建模和与固态微剂量计进行比较提供有价值的参考数据。

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引用次数: 0

Use of a Machine Learning based method to detect anomalous Thermoluminescence Glow Curves (TL-GC) in routine Dosimetry Services 在常规剂量测定服务中使用基于机器学习的方法检测异常热释光辉光曲线 (TL-GC)

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

Radiation Measurements

Pub Date : 2024-09-10 DOI: 10.1016/j.radmeas.2024.107293

O. Arquero , J. Berenguer-Antequera , J.F. Benavente

This contribution describes the development of a set of numerical methods based on Machine Learning algorithms to generate an automated classification of experimental Thermoluminescence (TL) Glow Curves obtained routinely by Dosimetry Services. This classification will use experimental data historically recorded by Thermoluminescence Dosimeter (TLD) devices and will be based on the search for possible anomalies in the curves. The classifier tool will ease the labelling of experimental data and the detection of anomalies without previous supervision, implying an improvement in the control evaluations in Quality Guarantee Systems often implemented by Dosimetry Services. Furthermore, this study shows that each curve provides information about the status of each dosimeter, and can be used to perform unsupervised classifications of the measurements.

本论文介绍了一套基于机器学习算法的数值方法的开发过程，该方法可对剂量测定服务部门日常获得的实验性热释光（TL）辉光曲线进行自动分类。该分类将使用热释光剂量计（TLD）设备历史记录的实验数据，并基于对曲线中可能存在的异常情况的搜索。分类器工具将简化实验数据的标注和异常检测，而无需事先监督，这意味着剂量测定服务部门通常实施的质量保证体系中的控制评估将得到改进。此外，这项研究还表明，每条曲线都提供了有关每个剂量计状态的信息，可用于对测量结果进行无监督分类。

引用次数: 0

Thermoluminescence properties of β-ray irradiated LuAGG:Ce nanophosphors prepared by sol-gel method for potential applications in dosimetry 溶胶-凝胶法制备的 β 射线辐照 LuAGG:Ce 纳米磷的热致发光特性在剂量测定中的潜在应用

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

Radiation Measurements

Pub Date : 2024-09-10 DOI: 10.1016/j.radmeas.2024.107296

S. Saadi , D.E. Kdib , A. Boukerika , R. Berreksi , A. Bentabet , S. Mahtout , Z. L Mokrani

In this paper, Lu_2.97Al_5–xGa_xO₁₂:Ce_0.03 (x = 0, 1, 2, 3) nanophosphors were synthesized using sol-gel method and calcined at 1100 °C for 3 h. The effect of Ga content on the structural, photoluminescence (PL), and notably thermoluminescence (TL) glow curve, dose response, repeatability and fading properties were investigated. X-ray diffraction (XRD) results indicated that all synthesized samples were crystallized in a pure garnet phase. The PL emission spectra exhibited a broad emission band corresponding to the 5 d → 4f (²F_5/2, ²F_7/2) transition of Ce³⁺ ions in the garnet lattice. Furthermore, a significant decrease in emission intensity was observed upon increasing Ga content. The TL characteristics of nanopowders irradiated with β-rays revealed a significant effect of Ga content on the peak position, shape and intensities of TL Glow curves, which can be explained by the reduction of the energy gap and the distribution of trap levels. The dose response linearity in the range of 0.125–100 Gy was examined for different Ga content, revealing a good linear behavior for x = 0 and 1 Ga. Additionally, samples prepared with x = 0, 1, and 2 Ga exhibited a high level of repeatability across a batch of 10 samples. Also, fading studies were performed for 128 h and revealed strong fading in samples synthesized with x = 0 and 1 Ga. These results suggest potential applications of Lu₃Al₅O₁₂:Ce and Lu₃Al₄Ga₁O₁₂:Ce in ionizing radiation dosimetry.

本文采用溶胶-凝胶法合成了 Lu2.97Al5-xGaxO12:Ce0.03（x = 0、1、2、3）纳米磷酸盐，并在 1100 °C 煅烧 3 h。研究了 Ga 含量对结构、光致发光 (PL) 和显著热致发光 (TL) 辉光曲线、剂量响应、重复性和衰减特性的影响。X 射线衍射 (XRD) 结果表明，所有合成样品均为纯石榴石相结晶。聚光发射光谱显示出一个宽发射带，对应于石榴石晶格中 Ce3+ 离子的 5 d → 4f (2F5/2, 2F7/2)转变。此外，随着镓含量的增加，发射强度也明显下降。用 β 射线辐照纳米粉体的 TL 特性表明，镓含量对 TL 辉光曲线的峰值位置、形状和强度有显著影响，这可以用能隙的减小和陷阱水平的分布来解释。对不同镓含量在 0.125-100 Gy 范围内的剂量响应线性进行了研究，结果表明 x = 0 和 1 Ga 具有良好的线性行为。此外，用 x = 0、1 和 2 Ga 制备的样品在一批 10 个样品中表现出较高的重复性。此外，还对 x = 0 和 1 Ga 合成的样品进行了长达 128 小时的衰减研究，结果表明这些样品具有很强的衰减性。这些结果表明了 Lu3Al5O12:Ce 和 Lu3Al4Ga1O12:Ce 在电离辐射剂量测定中的潜在应用。

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