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Validation of a general-use high flux isotope reactor–specific metaheuristic optimization framework for isotope production target design 验证用于同位素生产目标设计的通用高通量同位素反应堆特定元启发式优化框架
IF 1.6 3区 工程技术 Q3 CHEMISTRY, INORGANIC & NUCLEAR Pub Date : 2024-11-20 DOI: 10.1016/j.apradiso.2024.111592
C. Salyer , S. Bogetic , J. Griswold
Currently, advanced optimization methods are limited for isotope production (IP) campaigns at the US Department of Energy’s High Flux Isotope Reactor (HFIR) located at Oak Ridge National Laboratory (ORNL), leading to years of conservative and historical approaches with minimal innovation. Moreover, the growing demand for new and existing isotopes is beginning to challenge the capacity of HFIR. This work explores the development and integration of metaheuristic (MH) optimization techniques for more efficient target design and irradiation strategies. As a test case, the optimization framework was applied to a routinely produced isotope at HFIR, 188W, with the objective of maximizing the specific activity (SA), a key production metric. The framework includes Gnowee, a Python-based MH optimization algorithm, coupled with the Monte Carlo N-Particle version 6 (MCNP6) and Oak Ridge Isotope Generation (ORIGEN) activation/depletion/decay codes to design, simulate, and evaluate thousands of potential target design and irradiation scheme candidates. The framework relies on mock input files, design and irradiation variables for the algorithm to select, as well as a user-defined objective function to score each candidate based on the returned SA. Given the inherent complexities and computational time required when modeling and simulating the full HFIR model, a novel simplified MCNP6 model is presented in this article to increase the computational efficiency of the framework. The variables explored include irradiation location, number of cycles, and the number of W samples. Over 1,000 simplified model candidates were simulated in the same amount of time as a single full HFIR model run. By comparing the simplified model optimization’s top candidate(s) with the full HFIR model results, the framework was verified to accurately explore the design space and converge on the top performing candidates. Lastly, past experimental data was compared to the data generated by the framework/model and both show that fewer W rings return higher SA, as expected. The verified and validated techniques provide a standardized solution to increase IP efficiencies by exploring thousands of unique target designs and irradiation strategies in a similar time as that required to run a single case in the full HFIR MCNP6 model. Both the novel simplified model and the full HFIR model show a more than 30% increase in SA if all presented modifications are applied to the current design and strategy. Thus, the objective of building a general-use, computationally efficient optimization framework for HFIR IP was accomplished, and has the potential to be applied to other IP campaigns.
目前,美国能源部位于橡树岭国家实验室(ORNL)的高通量同位素反应堆(HFIR)的同位素生产(IP)活动中,先进的优化方法非常有限,导致多年来一直采用保守的历史方法,创新性极低。此外,对新同位素和现有同位素日益增长的需求也开始挑战高通量同位素反应堆的能力。这项工作探索了元启发式(MH)优化技术的开发和整合,以实现更高效的靶设计和辐照策略。作为一个测试案例,优化框架被应用于 HFIR 常规生产的同位素 188W,目标是最大化比活度(SA),这是一个关键的生产指标。该框架包括基于 Python 的 MH 优化算法 Gnowee,以及蒙特卡罗 N 粒子版本 6 (MCNP6) 和橡树岭同位素生成 (ORIGEN) 激活/耗竭/衰变代码,用于设计、模拟和评估数千个潜在的目标设计和辐照方案候选方案。该框架依赖模拟输入文件、设计和辐照变量供算法选择,以及用户定义的目标函数,根据返回的 SA 对每个候选方案进行评分。鉴于完整的 HFIR 模型建模和仿真所固有的复杂性和所需的计算时间,本文提出了一个新颖的简化 MCNP6 模型,以提高该框架的计算效率。所探讨的变量包括辐照位置、周期数和 W 样本数。在与运行一个完整的 HFIR 模型相同的时间内,模拟了 1,000 多个简化候选模型。通过比较简化模型优化的最佳候选模型和完整 HFIR 模型的结果,验证了该框架能够准确地探索设计空间,并收敛到性能最佳的候选模型上。最后,将过去的实验数据与该框架/模型生成的数据进行了比较,结果表明,正如预期的那样,较少的 W 环会产生较高的 SA 值。经过验证和确认的技术提供了一种标准化的解决方案,通过探索数千种独特的目标设计和辐照策略来提高 IP 效率,所需的时间与在完整的 HFIR MCNP6 模型中运行一个案例所需的时间相近。如果对当前的设计和策略进行所有的修改,新的简化模型和完整的 HFIR 模型都能将 SA 提高 30% 以上。因此,为 HFIR IP 建立一个通用、计算效率高的优化框架的目标已经实现,并有可能应用于其他 IP 活动。
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引用次数: 0
Gamma ray induced significant phenotypic and metabolite changes in sugarcane variants derived through in vitro mutagenesis 伽马射线诱导通过体外诱变获得的甘蔗变异体显著的表型和代谢物变化。
IF 1.6 3区 工程技术 Q3 CHEMISTRY, INORGANIC & NUCLEAR Pub Date : 2024-11-20 DOI: 10.1016/j.apradiso.2024.111597
G. Ariharasutharsan , Pooja Negi , P. Vinoth , A. Malarvizhi , P. Senthilrajan , C. Appunu , Ashish K. Srivastava , R. Valarmathi
Sugarcane is an economically important polyploid crop whose genetic complexity and limited fertility poses a challenge for crop improvement programs. Gamma radiation-induced mutagenesis is an alternate approach for generating a diverse array of agronomically useful mutants, accelerating varietal development in a long-duration crop like sugarcane. To develop agronomically useful mutants of a commercial sugarcane genotype Co 99004, gamma ray induced in vitro mutagenesis was carried out. The phenotypic variants of Co 99004 in V1 generation could be categorized into five distinct phenotypically scorable classes, including three chlorophyll mutants (albina, chlorina and chlorina pigmented) and two green mutants like wild type control. SRAP marker analyses indicated distinct genomic variation among the phenotypic mutants and control plants, with the polymorphic information content (PIC) ranging from 0 to 0.472. Further, the phylogenetic dendrogram derived from the SRAP marker data grouped the mutants into four distinct clusters clearly differentiating the phenotypic classification. Sequencing of selected SRAP amplicons indicated deletion/insertion of gene specific fragments. Interestingly, the loss of chlorophyll in albina and chlorina mutants showed gamma irradiation-induced deletions in the gene encoding FAR1-RELATED SEQUENCE 5-like protein, which is involved in chlorophyll biosynthesis. GC-MS based metabolome profiling showed alteration in tetrapyrrole biosynthesis, MEP (Methylerythritol Phosphate), and fatty acid biosynthesis pathways, indicating a significant metabolic variation in the chlorophyll mutants. Further characterization of the genetically distinct, non-lethal green wild type mutants can lead to the identification of agronomically useful mutants. In addition, the loss-of-function chlorophyll mutants can serve as a good source for comparative genomics studies aimed at gene-trait association.
甘蔗是一种具有重要经济价值的多倍体作物,其遗传复杂性和有限的肥力对作物改良计划提出了挑战。伽马辐射诱变是产生多种农艺学上有用的突变体的另一种方法,可以加速甘蔗等长期作物的品种发育。为获得具有农艺价值的商业甘蔗co99004基因型突变体,对其进行了体外诱变研究。co99004 V1代表型变异可分为5个不同的表型可评分类,包括3个叶绿素突变体(白化、氯化和氯化色素)和2个绿色突变体(如野生型对照)。SRAP标记分析表明,表型突变体和对照植株之间存在明显的基因组差异,多态性信息含量(PIC)在0 ~ 0.472之间。此外,基于SRAP标记数据的系统发育树状图将突变体分为四个不同的簇,明确区分了表型分类。选定的SRAP扩增子测序显示基因特异性片段的缺失/插入。有趣的是,在白化病和氯化病突变体中,叶绿素的丢失显示出伽马辐射诱导的编码far1相关序列5样蛋白的基因缺失,该基因参与叶绿素的生物合成。基于GC-MS的代谢组分析显示,四吡啶生物合成、甲基赤藓糖醇磷酸(MEP)和脂肪酸生物合成途径发生了改变,表明叶绿素突变体的代谢发生了显著变化。进一步鉴定遗传上不同的、非致死的绿色野生型突变体可以鉴定出农艺学上有用的突变体。此外,丧失功能的叶绿素突变体可以作为比较基因组学研究的一个很好的来源,旨在研究基因-性状关联。
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引用次数: 0
Monte Carlo study of organ doses and related secondary cancer risk estimations for patients undergoing prostate radiotherapy: Algerian population-based study 对接受前列腺放射治疗的患者进行器官剂量和相关继发性癌症风险估计的蒙特卡洛研究:阿尔及利亚人口研究
IF 1.6 3区 工程技术 Q3 CHEMISTRY, INORGANIC & NUCLEAR Pub Date : 2024-11-19 DOI: 10.1016/j.apradiso.2024.111595
Asma Alem-Bezoubiri , Fethi Bezoubiri , Michael Speiser , Suleiman Ameir Suleiman , Hossam Donya , Ahmed Chafik Chami
The present study aimed to assess organ doses and the associated cancer risks related to secondary radiation (photons and neutrons) exposure during 3D Conformational Radiotherapy (3D-CRT) for patients with prostate cancer in Algeria. To this purpose, a detailed geometric Monte Carlo (MC) modeling of the LINAC, combined with a hybrid whole-body phantom was carried out. The secondary radiation doses were calculated in patient's organs, both within and outside the field. The obtained doses were used to estimate the Lifetime Attributable Risks (LARs) for cancer incidence for out of field organs, using the Biological Effects of Ionizing Radiation VII (BEIR VII) risk model, considering the exposure age range according to the age of the treated patients in Algeria. The survival information and baseline cancer risks were based on relevant statistics for the Algerian population. The results revealed that secondary radiation equivalent doses mostly depend on the distance of organs from the treated volume. The highest and lowest equivalent doses of 5.77 mSv/Gy and 0.24 mSv/Gy were recorded in the small intestine and ocular lens, respectively. LARs decreased as the age of exposure increased, with the highest estimated value per 100,000 individuals identified at a 35-year exposure age (88 for the colon and 15 for the intestine). Conversely, the lowest risks were found at 70 years of age, specifically in rib bone and leg bone with value of (0). The current research could contribute to establishing a database concerning the incidence of secondary cancers induced by radiotherapy during 3D-CRT for prostate cancer in Algeria.
本研究旨在评估阿尔及利亚前列腺癌患者在接受三维适形放射治疗(3D-CRT)期间的器官剂量以及与二次辐射(光子和中子)照射相关的癌症风险。为此,我们结合混合全身模型,对 LINAC 进行了详细的几何蒙特卡罗(MC)建模。计算了场内外患者器官的二次辐射剂量。利用电离辐射生物效应 VII(BEIR VII)风险模型,并考虑到阿尔及利亚接受治疗的患者年龄的照射年龄范围,所获得的剂量被用于估算场外器官癌症发病的终生可归属风险(LARs)。生存信息和基线癌症风险基于阿尔及利亚人口的相关统计数据。结果显示,二次辐射当量剂量主要取决于器官与治疗部位的距离。小肠和眼晶状体的等效剂量最高为 5.77 mSv/Gy,最低为 0.24 mSv/Gy。等效剂量随暴露年龄的增加而降低,每 10 万人的最高估计值出现在暴露年龄为 35 岁的人群中(结肠为 88,肠道为 15)。相反,70 岁时的风险最低,特别是肋骨和腿骨的风险值为(0)。目前的研究有助于建立阿尔及利亚前列腺癌 3D-CRT 放疗诱发继发性癌症发病率的数据库。
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引用次数: 0
Evaluation of 14C/12C ratio measurements using accelerator mass spectrometry with standard materials under different graphitization conditions 在不同石墨化条件下使用加速器质谱对标准材料进行 14C/12C 比值测量的评估
IF 1.6 3区 工程技术 Q3 CHEMISTRY, INORGANIC & NUCLEAR Pub Date : 2024-11-17 DOI: 10.1016/j.apradiso.2024.111589
Sae-Hoon Park, Seung-Won Lee, Yu-Seok Kim
In this study, an evaluation of carbon-beam tuning and 14C/12C ratio measurements is performed to validate the graphitization process in the pre-processing procedure employed at the accelerator mass spectrometry (AMS) facility of Dongguk University in Korea. The AMS isotopic ratio data are analyzed for samples subjected to three different graphitization conditions: (1) the entire process including Fe catalyst pre-heating with a high vacuum, (2) a high vacuum without pre-heating, and (3) a low vacuum without pre-heating. High-quality isotopic ratio measurements are achieved under these conditions. The measured mean isotopic ratio values for the background samples are almost equivalent to the different graphitization condition samples, with a difference in the order of 10−16. Therefore, conducting measurements with or without Fe catalyst pre-heating or high vacuum conditions is equally viable. Furthermore, the simplification of the graphitization process steps reduces the processing time required to produce five samples from 8 to 4 h, thereby enhancing the daily sample throughput by a factor of two, without compromising data quality.
本研究对碳束调谐和 14C/12C 比率测量进行了评估,以验证韩国东国大学加速器质谱(AMS)设施所采用的预处理程序中的石墨化过程。对三种不同石墨化条件下的样品进行了 AMS 同位素比数据分析:(1) 包括铁催化剂高真空预热在内的整个过程;(2) 无预热的高真空;(3) 无预热的低真空。在这些条件下都能进行高质量的同位素比测量。所测量的背景样品平均同位素比值与不同石墨化条件下的样品几乎相当,相差在 10-16 数量级。因此,在有无铁催化剂预热或高真空条件下进行测量同样可行。此外,石墨化过程步骤的简化将生产 5 个样品所需的处理时间从 8 小时减少到 4 小时,从而在不影响数据质量的情况下将每日样品吞吐量提高了 2 倍。
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引用次数: 0
Larvicidal and adulticidal activity of irradiated Thuja orientalis essential oil by gamma radiation for controlling Culex pipiens 伽马射线辐照东方鸦胆子精油在防治鸦胆子幼虫和成虫方面的活性。
IF 1.6 3区 工程技术 Q3 CHEMISTRY, INORGANIC & NUCLEAR Pub Date : 2024-11-16 DOI: 10.1016/j.apradiso.2024.111591
A.M. Gharib , S.S. Hamouda , A.F. Hamza , N.F. Zahran
Culex pipiens mosquitoes are the primary vector of the West Nile virus worldwide and have a wide distribution. To avoid the development of resistance in insect pests to conventional synthetic pesticides, there have been many attempts to study botanical pesticides. The increasing resistance of insect pests to synthetic pesticides is a threat to the diversity of ecosystems, which makes the study of botanical pesticides all the more important. The study aimed to determine the efficacy of Thuja orientalis essential oil irradiated with 1, 3 and 5 KGy compared to unirradiated T. orientalis as larvicidal agents against the third instar larvae of C. pipiens using six different concentrations (15, 20, 25, 30, 35 and 40 ppm) and as an adulticidal agent against approximately three-day-old female adults 0.2, 0.4, 0.6, 1 and 2%. The results generally showed that the irradiated essential oil with 5 KGy had the highest efficacy by LC50 (20.16 ppm) followed by essential oil irradiated with 3 and 1 KGy (LC50, 23.16 and 26.00 ppm, respectively) compared to unirradiated ones (LC50, 27.28 ppm) after 24 h from the exposure for the third instar larvae. The knockdown effect for adults increased significantly with higher concentrations of the oil, across different exposure times ranging from 5 to 60 min. The time to knock down 100% of mosquito population to Thuja orientalis essential oils at the highest concentration 2% were 20 min at 0, 1, and 3 KGy and 10 min at 5 KGy. Our results indicate that gamma irradiation of T. orientalis fruit improves the efficacy of their essential oil against Culex pipiens and the irradiated oil could be successfully used for management of these insects. The head capsule, antenna, and the last abdominal segments of the 3rd instar larvae exposed to the essential oil of unirradiated or irradiated Thuja orientalis unripe were examined by the scanning electron microscope (SEM).
库蚊是全球西尼罗河病毒的主要传播媒介,分布广泛。为了避免害虫对传统合成杀虫剂产生抗药性,人们尝试研究植物杀虫剂。害虫对合成杀虫剂的抗药性越来越强,对生态系统的多样性构成了威胁,因此植物杀虫剂的研究显得更加重要。该研究旨在确定用 1、3 和 5 KGy 照射东方鸦雀精油与未照射东方鸦雀精油相比,东方鸦雀精油作为杀幼虫剂对琵鹭第三龄幼虫的药效,使用了六种不同的浓度(15、20、25、30、35 和 40 ppm),作为成虫杀虫剂对大约三天大的雌性成虫的药效分别为 0.2%、0.4%、0.6%、1% 和 2%。结果表明,与未经过辐照的精油(半数致死浓度为 27.28 ppm)相比,经过 5 KGy 辐照的精油在 24 小时后对三龄幼虫的半数致死浓度(20.16 ppm)最高,其次是经过 3 KGy 和 1 KGy 辐照的精油(半数致死浓度分别为 23.16 ppm 和 26.00 ppm)。在 5 至 60 分钟的不同暴露时间内,成虫的击倒效果随着油的浓度越高而显著增加。在 0、1 和 3 千克辐照度下,用最高浓度 2% 的东方桉树精油 100%杀死蚊子的时间为 20 分钟;在 5 千克辐照度下,用最高浓度 2% 的东方桉树精油 100%杀死蚊子的时间为 10 分钟。我们的研究结果表明,用伽马射线辐照东方蓟马果实可提高其精油对库蚊的功效,辐照后的精油可成功用于防治这些昆虫。用扫描电子显微镜(SEM)观察了暴露于未经过辐照或经过辐照的东方柚精油的三龄幼虫的头囊、触角和腹部末节。
{"title":"Larvicidal and adulticidal activity of irradiated Thuja orientalis essential oil by gamma radiation for controlling Culex pipiens","authors":"A.M. Gharib ,&nbsp;S.S. Hamouda ,&nbsp;A.F. Hamza ,&nbsp;N.F. Zahran","doi":"10.1016/j.apradiso.2024.111591","DOIUrl":"10.1016/j.apradiso.2024.111591","url":null,"abstract":"<div><div><em>Culex pipiens</em> mosquitoes are the primary vector of the West Nile virus worldwide and have a wide distribution. To avoid the development of resistance in insect pests to conventional synthetic pesticides, there have been many attempts to study botanical pesticides. The increasing resistance of insect pests to synthetic pesticides is a threat to the diversity of ecosystems, which makes the study of botanical pesticides all the more important. The study aimed to determine the efficacy of <em>Thuja orientalis</em> essential oil irradiated with 1, 3 and 5 KGy compared to unirradiated <em>T. orientalis</em> as larvicidal agents against the third instar larvae of <em>C. pipiens</em> using six different concentrations (15, 20, 25, 30, 35 and 40 ppm) and as an adulticidal agent against approximately three-day-old female adults 0.2, 0.4, 0.6, 1 and 2%. The results generally showed that the irradiated essential oil with 5 KGy had the highest efficacy by LC<sub>50</sub> (20.16 ppm) followed by essential oil irradiated with 3 and 1 KGy (LC<sub>50</sub>, 23.16 and 26.00 ppm, respectively) compared to unirradiated ones (LC<sub>50</sub>, 27.28 ppm) after 24 h from the exposure for the third instar larvae. The knockdown effect for adults increased significantly with higher concentrations of the oil, across different exposure times ranging from 5 to 60 min. The time to knock down 100% of mosquito population to <em>Thuja orientalis</em> essential oils at the highest concentration 2% were 20 min at 0, 1, and 3 KGy and 10 min at 5 KGy. Our results indicate that gamma irradiation of <em>T. orientalis</em> fruit improves the efficacy of their essential oil against <em>Culex pipiens</em> and the irradiated oil could be successfully used for management of these insects. The head capsule, antenna, and the last abdominal segments of the 3rd instar larvae exposed to the essential oil of unirradiated or irradiated Thuja orientalis unripe were examined by the scanning electron microscope (SEM).</div></div>","PeriodicalId":8096,"journal":{"name":"Applied Radiation and Isotopes","volume":"216 ","pages":"Article 111591"},"PeriodicalIF":1.6,"publicationDate":"2024-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142685770","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Impact of dose and heating rate on thermoluminescence kinetics in aquamarine (Be3Al2(SiO3)6:Fe) 剂量和加热速率对海蓝宝石(Be3Al2(SiO3)6:Fe)热发光动力学的影响。
IF 1.6 3区 工程技术 Q3 CHEMISTRY, INORGANIC & NUCLEAR Pub Date : 2024-11-16 DOI: 10.1016/j.apradiso.2024.111593
Pedro Sena, Héctor Maya, Rafael Cogollo
The study of a thermoluminescent (TL) material begins with the response of the material to different doses of radiation and different rates of heating (Bos, 2006a), For this reason, the present work deals with the possible variations of the kinetic parameters for two groups of glow curves of beryl in its variety known as aquamarine. (Be3Al2(SiO3)6: Fe). The exposure and reading process was performed in a RISO TL/OSL DA-20 reader at room temperature. For the development of this work, the sample was irradiated at different doses (Between 4 and 100 Gy) of β-radiation with a source of 90Sr/90Y. The glow curve was recorded at a heating rate of 1 °C/s. The results show four experimental glow peaks around the 75, 115, 189 y 302 °C. The glow peak with the highest intensity at about 75 °C is referred to as the "main peak". A second set of glow curves was obtained with a radiation dose β of 1 Gy. These were recorded at different heating rates between 0.5 and 5 °C/s. The glow peaks show a shift towards higher temperature values as the heating rate increases, in agreement with theory. However, a slight decrease in the area of the glow peak is observed, more pronounced in the case of the main peak. The kinetic analysis performed on the glow curves recorded at different doses of beta radiation and heating rates, using different methods of kinetic theory, such as the initial ascent method, full peak glow, curve fitting and the dimensionless fitting method, shows that the trapping parameters (activation energy, frequency factor, and order parameter) are independent of the absorbed dose, in the measured range, and of the heating rate used.
对热发光(TL)材料的研究始于该材料对不同辐射剂量和不同加热速率的反应(Bos,2006a),因此,本研究涉及被称为海蓝宝石的绿柱石的两组发光曲线的动力学参数的可能变化。(Be3Al2(SiO3)6: Fe)。曝光和读取过程在室温下的 RISO TL/OSL DA-20 读取器中进行。为了完成这项工作,样品在不同剂量(4 至 100 Gy)的 β 辐射下,用 90Sr/90Y 源进行辐照。以 1 °C/s 的加热速率记录辉光曲线。结果显示,在 75、115、189 y 302 °C 附近有四个实验辉光峰。在 75 °C 左右强度最高的辉光峰被称为 "主峰"。第二组辉光曲线是在辐射剂量 β 为 1 Gy 时获得的。这些曲线是在 0.5 至 5 °C/s 的不同加热速率下记录的。随着加热速率的增加,辉光峰值显示出向更高温度值的移动,这与理论相符。不过,辉光峰的面积略有减小,主峰的情况更为明显。使用不同的动力学理论方法,如初始上升法、全峰辉光、曲线拟合和无量纲拟合法,对不同剂量的β辐射和加热速率下记录的辉光曲线进行的动力学分析表明,在测量范围内,俘获参数(活化能、频率因子和阶次参数)与吸收剂量和所使用的加热速率无关。
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引用次数: 0
On the SRIM prediction of ranges for Ni ions 关于镍离子的 SRIM 预测范围。
IF 1.6 3区 工程技术 Q3 CHEMISTRY, INORGANIC & NUCLEAR Pub Date : 2024-11-14 DOI: 10.1016/j.apradiso.2024.111590
A.F. Gurbich, P.S. Prusachenko, T.L. Bobrovskiy, M.V. Bokhovko
An experiment to determine the range of Ni ions in matter consisting in the implantation of nickel ions into samples followed by the determination of the depth profile of the implanted ions by nuclear reaction resonance profiling was performed. The experimentally obtained ranges for Ni ions in Fe and Mo were compared with SRIM-2013 (www.srim.org) and TRIM-98 predictions. It was found that the ranges predicted by SRIM-2013 are significantly overestimated whereas the calculation results obtained with TRIM-98 modified to take into account radiation-enhanced diffusion are consistent with the experimental data.
为确定物质中镍离子的范围,进行了一项实验,将镍离子植入样品,然后通过核反应共振剖面测定植入离子的深度剖面。实验得出的铁和钼中镍离子的范围与 SRIM-2013 (www.srim.org) 和 TRIM-98 的预测进行了比较。结果发现,SRIM-2013 预测的范围明显被高估了,而 TRIM-98 考虑到辐射增强扩散而修改的计算结果与实验数据一致。
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引用次数: 0
Optimizing radiation dosimetry: Impact of PMMA layers on electronic equilibrium for the calibration of radiation protection instruments 优化辐射剂量测定:PMMA 层对辐射防护仪器校准电子平衡的影响。
IF 1.6 3区 工程技术 Q3 CHEMISTRY, INORGANIC & NUCLEAR Pub Date : 2024-11-14 DOI: 10.1016/j.apradiso.2024.111588
Taibi Zidouz , Abdelatif Talbi , El Mahjoub Chakir , Elmehdi Alibrahmi , Mohammed Zaryah , Abderahim Allach , Abdessamad Didi , Abdelwahab Abarane
In radiation dosimetry, achieving electronic equilibrium is vital for accurate dose measurements in radioprotection. This study investigates the effect of Poly Methyl Methacrylate (PMMA) layers, known by its chemical formula C5H8O2 and a density of 1.19 g/cm³ (PNNL, 2011), on electronic equilibrium for the calibration of radiation protection instruments, focusing on photon beams of varying energies. Using DOSIMEX 2.0 simulation software, we modeled the influence of PMMA thickness on calibration factors across different X-ray and gamma-ray beam energies. Experimental validation with Cs-137 and Co-60 sources confirmed the reliability of the simulation. Our results highlight that while PMMA layers have a minimal impact on calibration for higher-energy beams, their role becomes significant for energies below 40 keV. For X-ray beams (From 30 to 140 kV), the results show minimal calibration factor deviation (<1.6%), whereas radionuclide beams exhibit more significant variations (4.1%), necessitating customized calibration approaches. This study underscores the importance of adhering to ISO 4037-3 standards in radioprotection, particularly in low-energy scenarios, to ensure the precision of calibration procedures and optimize radiation protection practices. Furthermore, based on the results obtained, the absence of PMMA does not have a dramatic effect on the calibration of X-ray radiation instruments, whereas for gamma-ray beams, it has a significant impact.
在辐射剂量测定中,实现电子平衡对辐射防护中的精确剂量测量至关重要。本研究调查了聚甲基丙烯酸甲酯(PMMA)层(化学式为 C5H8O2,密度为 1.19 g/cm³(PNNL,2011 年))对辐射防护仪器校准电子平衡的影响,重点是不同能量的光子束。利用 DOSIMEX 2.0 仿真软件,我们模拟了 PMMA 厚度对不同 X 射线和伽马射线束能量下校准系数的影响。使用 Cs-137 和 Co-60 源进行的实验验证证实了模拟的可靠性。我们的结果表明,虽然 PMMA 层对较高能量光束的校准影响很小,但在能量低于 40 keV 时,它们的作用就变得非常重要。对于 X 射线束(从 30 到 140 kV),结果显示校准因子偏差最小 (
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引用次数: 0
ACO-based feature selection and neural network modeling for accurate gamma-radiation based pipeline monitoring in the oil industry 基于 ACO 的特征选择和神经网络建模,用于石油工业中基于伽马射线的管道精确监测。
IF 1.6 3区 工程技术 Q3 CHEMISTRY, INORGANIC & NUCLEAR Pub Date : 2024-11-13 DOI: 10.1016/j.apradiso.2024.111587
Abdulilah Mohammad Mayet , Seyed Mehdi Alizadeh , Muneer Parayangat , John William Grimaldo Guerrero , M. Ramkumar Raja , Mohammed Abdul Muqeet , Salman Arafath Mohammed
This work presents a novel technique to improve oil pipeline monitoring capabilities, a vital activity in the oil and gas sector. Using Monte Carlo simulations, the work meticulously records data from a pipeline testing environment with various petroleum products and volume ratios. We apply the presented technique to mix four petroleum products—ethylene glycol, gasoline, crude oil, and gasoil—in different volumetric fractions to precisely determine their volume ratios. Many characteristics of the signal, including its mean, standard deviation, autocorrelation, zero-crossing rate, dominant frequency, power spectral density, harmonic-to-noise ratio, cross-frequency coupling, peak-to-peak amplitude, and fall time, are extracted after data collection. To select optimal features, an innovative approach utilizing ant colony optimization is deployed, systematically identifying the most informative feature combinations for volumetric ratio prediction. These meticulously chosen features serve as inputs to a multilayer perceptron (MLP) neural network tasked with accurately determining the volume ratio of the pipeline contents. Remarkably, the methodology showcases remarkable efficacy, with the root mean square error (RMSE) in volume ratio determination found to be less than 0.52. This significant finding not only underscores the robustness of the proposed approach but also promises to revolutionize pipeline monitoring techniques, offering unprecedented accuracy and efficiency in oil industry operations. This research thus represents a pivotal advancement in the field, with far-reaching implications for both academic research and practical applications within the oil and gas sector.
这项研究提出了一种新颖的技术,用于提高石油管道监测能力,这是石油和天然气领域的一项重要活动。通过蒙特卡罗模拟,该作品细致地记录了来自不同石油产品和体积比的管道测试环境的数据。我们将所介绍的技术用于将四种石油产品--乙二醇、汽油、原油和燃气油--以不同的体积分数混合,以精确确定它们的体积比。数据采集完成后,将提取信号的许多特征,包括平均值、标准偏差、自相关性、过零率、主频、功率谱密度、谐波噪声比、跨频耦合、峰-峰振幅和下降时间。为了选择最佳特征,我们采用了一种利用蚁群优化的创新方法,系统地识别出信息量最大的特征组合,用于体积比预测。这些精心选择的特征将作为多层感知器(MLP)神经网络的输入,该网络的任务是准确确定管道内容物的体积比。值得注意的是,该方法展示了显著的功效,体积比确定的均方根误差 (RMSE) 小于 0.52。这一重大发现不仅强调了所提方法的稳健性,而且有望彻底改变管道监测技术,为石油行业的运营提供前所未有的准确性和效率。因此,这项研究代表了该领域的一个关键进步,对石油和天然气行业的学术研究和实际应用都具有深远影响。
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引用次数: 0
Comprehensive investigation of carcinogenic radon levels in water within the Ikorodu axis of Lagos State, Nigeria 尼日利亚拉各斯州 Ikorodu 轴心地区水中致癌氡含量的综合调查。
IF 1.6 3区 工程技术 Q3 CHEMISTRY, INORGANIC & NUCLEAR Pub Date : 2024-11-12 DOI: 10.1016/j.apradiso.2024.111585
Olaoye Morohunfoluwa Adeola , Hyam Nazmy Bader Khalaf , Okedeyi Sodiq , Mostafa Y.A. Mostafa , Howaida Mansour
This study investigates radon concentration in drinking water from twenty samples collected at two tertiary Institutions in Ikorodu, Lagos State, using the RAD-7 detector. The objective is to evaluate the health risks associated with radon exposure, a known carcinogen linked to lung and stomach cancer. Radon in drinking water contributes to approximately 168 cancer deaths annually, predominantly from lung cancer due to inhalation of radon released indoors and stomach cancer from ingesting contaminated water. The measured radon concentrations ranged from 4.5 ± 1.1 Bq/m³ to 25.5 ± 2.1 Bq/m³, with 70% of samples exceeding the EPA's maximum contamination level of 11.1 Bq/L. Despite these high levels, the annual effective doses from ingestion and inhalation varied from 0.4545 to 24.37 μSv/y, remaining below the global average of 300 μSv/y and WHO limit of 100 μSv/y. While the presence of radon in Ikorodu's water sources indicates a radiological risk, the associated health risks are comparatively low according to international standards. These findings underscore the importance of ongoing monitoring and potential mitigation measures to ensure the continued safety of drinking water in the region.
本研究使用 RAD-7 检测器对拉各斯州伊科罗杜市两所高等院校收集的 20 份样本中饮用水的氡浓度进行了调查。目的是评估与氡接触相关的健康风险,氡是一种已知的致癌物质,与肺癌和胃癌有关。饮用水中的氡每年导致约 168 人死于癌症,主要是由于吸入室内释放的氡而导致肺癌,以及由于摄入受污染的水而导致胃癌。测得的氡浓度范围为 4.5 ± 1.1 Bq/m³ 到 25.5 ± 2.1 Bq/m³,其中 70% 的样本超过了美国环保局规定的最高污染水平 11.1 Bq/L。尽管氡含量很高,但每年摄入和吸入的有效剂量从 0.4545 到 24.37 μSv/y 不等,仍低于全球平均值 300 μSv/y 和世界卫生组织的限值 100 μSv/y。虽然伊科罗杜水源中存在氡表明存在放射性风险,但根据国际标准,相关的健康风险相对较低。这些发现强调了持续监测和潜在缓解措施的重要性,以确保该地区饮用水的持续安全。
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Applied Radiation and Isotopes
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