Nuclear Analysis最新文献_第6页

Origin assessment of uranium ores using multivariate statistical method based on their rare-earth elemental parameters 基于稀土元素参数的铀矿石成因多元统计评价

Nuclear Analysis Pub Date : 2022-09-01 DOI: 10.1016/j.nucana.2022.100027

Xuepeng Shao, Wenting Bu, Youyi Ni, Hailong Wang, Xuemei Liu, Chuting Yang, Fanhua Hao

{"title":"Origin assessment of uranium ores using multivariate statistical method based on their rare-earth elemental parameters","authors":"Xuepeng Shao, Wenting Bu, Youyi Ni, Hailong Wang, Xuemei Liu, Chuting Yang, Fanhua Hao","doi":"10.1016/j.nucana.2022.100027","DOIUrl":"10.1016/j.nucana.2022.100027","url":null,"abstract":"<div>Origin assessment of nuclear materials is the key aim of nuclear forensics. Among the various fingerprints, rare-earth elements (REEs) are regarded as a powerful geological signature in authentication studies as they behave similarly during geologic and mining/milling processes. In this study, the combination of rare-earth impurities and Nd–Ce isotope ratios were proposed as a novel fingerprint for the origin assessment of uranium ores. A database was established, comprising mass spectrometric measurements of rare-earth elemental parameters of twenty-five samples from seven countries. The efficiencies of different multivariate statistical techniques, including cluster analysis (CA), principal component analysis (PCA) and linear discriminant analysis (LDA), were compared. The results showed that most of uranium ore samples were correctly classified according to geographical origins, and Nd–Ce isotope ratios played a key role in improving the classification. High recognition (100%) and satisfactory predictive ability (90%) of the developed LDA model proved that the proposed method is a powerful tool for tracing unknown uranium ore samples.</div>","PeriodicalId":100965,"journal":{"name":"Nuclear Analysis","volume":"1 3","pages":"Article 100027"},"PeriodicalIF":0.0,"publicationDate":"2022-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2773183922000271/pdfft?md5=8518cff02b1de3345fa1edf9593f7263&pid=1-s2.0-S2773183922000271-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86019500","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Double heterojunction CQDs/CeO2/BaFe12O19 magnetic separation photocatalysts: Construction, structural characterization, dye and POPs removal, and the interrelationships between magnetism and photocatalysis 双异质结CQDs/CeO2/BaFe12O19磁分离光催化剂:构建、结构表征、染料和POPs去除，以及磁和光催化的相互关系

Nuclear Analysis Pub Date : 2022-09-01 DOI: 10.1016/j.nucana.2022.100026

Shifa Wang , Xiangyu Chen , Leiming Fang , Huajing Gao , Mengjun Han , Xiping Chen , Yuanhua Xia , Lei Xie , Hua Yang

{"title":"Double heterojunction CQDs/CeO2/BaFe12O19 magnetic separation photocatalysts: Construction, structural characterization, dye and POPs removal, and the interrelationships between magnetism and photocatalysis","authors":"Shifa Wang , Xiangyu Chen , Leiming Fang , Huajing Gao , Mengjun Han , Xiping Chen , Yuanhua Xia , Lei Xie , Hua Yang","doi":"10.1016/j.nucana.2022.100026","DOIUrl":"10.1016/j.nucana.2022.100026","url":null,"abstract":"<div>This novel double heterojunction carbon quantum dots (CQDs)/CeO2/BaFe12O19 magnetic separation photocatalysts (CCBFOMSPs) were successfully prepared via a polyacrylamide gel method and low temperature sintering technology combined with a hydrothermal method. The CQDs components in CCBFOMSPs were identified by neutron powder diffraction, Raman spectroscopy and X-ray photoelectron spectroscopy. The charge carriers could transfer and separation between the valence state components (CeO2 and BaFe12O19) and CQDs facilely, inhibiting the recombination of electron-hole pairs significantly by Hall effect. The photocatalytic activity of CCBFOMSPs for the degradation of mixed dyes include methyl orange (MO), rhodamine B (RhB) and methylene blue (MB) and tetrabromobisphenol A (TBBPA) were remarkably improved by regulating the electromagnetic interaction between the BaFe12O19 contents and the photo-generated electrons. Capturing experiment showed that the active species of hole (hVB+), hydroxyl radical (•OH) and superoxide radical (•O2−) played dominant roles in mixed dyes degradation. Attractively, the effect shed new light on wide applications of the double heterojunction magnetic separation photocatalysts.</div>","PeriodicalId":100965,"journal":{"name":"Nuclear Analysis","volume":"1 3","pages":"Article 100026"},"PeriodicalIF":0.0,"publicationDate":"2022-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S277318392200026X/pdfft?md5=77a3779b2db96171c982c1ccbd96b021&pid=1-s2.0-S277318392200026X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83550275","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 35

Effects of reflected neutrons on the reactivity measurement of metal Assemblies 反射中子对金属组件反应性测量的影响

Nuclear Analysis Pub Date : 2022-09-01 DOI: 10.1016/j.nucana.2022.100035

Hui Gao, Lingli Song, Meng Li, Jie Wen, Qilin Xie

引用次数: 0

Development and performance of a secondary electron detector based on a MCP 基于单片机的二次电子探测器的研制与性能研究

Nuclear Analysis Pub Date : 2022-09-01 DOI: 10.1016/j.nucana.2022.100036

Jun Xiao, Pu Zheng, Tonghua Zhu, Jianguo Qin, Junjie Sun, Yunfeng Mu, Xinxin Lu

{"title":"Development and performance of a secondary electron detector based on a MCP","authors":"Jun Xiao, Pu Zheng, Tonghua Zhu, Jianguo Qin, Junjie Sun, Yunfeng Mu, Xinxin Lu","doi":"10.1016/j.nucana.2022.100036","DOIUrl":"10.1016/j.nucana.2022.100036","url":null,"abstract":"<div>Secondary electron detector (SED) is a key component used in the fission product yield experiment to mark the start time of fission events. The signal to noise ratio and timing characteristics has an important impact on the mass resolution for measuring fission fragments. In this paper, a novel design of secondary electron detector based on MCP was proposed to measure the secondary electrons emitted from fission target. Based on the alpha particles and the fission fragments emitted from 252Cf source, the response of SED and SCVD diamond are obtained by using a digitizer of 10 bit and 1 G samples/s. The rise time of alpha particles and fission fragments are 1.8 ns and 1.7 ns, while the pulse width of which is 4.5 ns and 9.7 ns, respectively. Using the time of flight method and digital constant fraction algorithm, the time resolution of \"SED + sCVD diamond detector\" system for 6.1 MeV alpha particles from 252Cf is obtained as 242 ± 4.7 ps, while that of SED detector is about 171 ± 2.4 ps. The total transition length and time of secondary electron (SE) in the detector are 15.79 cm and 5.97 ns, respectively.</div>","PeriodicalId":100965,"journal":{"name":"Nuclear Analysis","volume":"1 3","pages":"Article 100036"},"PeriodicalIF":0.0,"publicationDate":"2022-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2773183922000362/pdfft?md5=78d504dbeb24ecc11abc9678806801eb&pid=1-s2.0-S2773183922000362-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79894493","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A fast numerical calculation method of polarized neutrons precession in multiplex magnetic field 多重磁场中极化中子进动的快速数值计算方法

Nuclear Analysis Pub Date : 2022-06-01 DOI: 10.1016/j.nucana.2022.100013

Xinxi Li , Yan Wang , Yong Ren , Chaoqiang Huang , Jie Chen , Dong Liu

引用次数: 0

Radiation target: Moving from theory to practice 辐射目标:从理论走向实践

Nuclear Analysis Pub Date : 2022-06-01 DOI: 10.1016/j.nucana.2022.100024

Qian Li , Guoping Zhao , Wei Han , Shengmin Xu , Lijun Wu

{"title":"Radiation target: Moving from theory to practice","authors":"Qian Li , Guoping Zhao , Wei Han , Shengmin Xu , Lijun Wu","doi":"10.1016/j.nucana.2022.100024","DOIUrl":"10.1016/j.nucana.2022.100024","url":null,"abstract":"<div>Radiation target theory refers to that ionizing radiation hits specific molecules or organellaes in cells, resulting in structural damage, gene mutation, chromosome breakage and other target effects of biological macromolecules. It is the most widely accepted theory in radiobiology, radiotherapy and radiation protection. Based on this theory, several different mathematical models have been proposed to evaluate the cell killing effect in radiotherapy and radiation risk assessment. In addition, the target(s)-related technologies have also been well developed. Here, we review the development of radiation target theory and mathematical models, focusing on the related researches on three key biological radiation targets: DNA, protein and lipid. Alternatively, improvements in physical radiation technology based on radiation targets and developments in biotechnology (e.g., omics analysis, chromatin conformation analysis, and the application of organoid models) are described. This review provides insights for a better understanding of the roles of targeting effects in radiobiology, and emphasizes the application value of target-related techniques in clinical treatment.</div>","PeriodicalId":100965,"journal":{"name":"Nuclear Analysis","volume":"1 2","pages":"Article 100024"},"PeriodicalIF":0.0,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2773183922000246/pdfft?md5=ea88b5e6679621cbc8936bc04fe5a9c9&pid=1-s2.0-S2773183922000246-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82294409","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

A method for quickly subtracting the contributions from 182Ta and 94Nb in activity measurement of 93mNb in reactor neutron environment 反应堆中子环境中93mNb活度测量中182Ta和94Nb贡献的快速减去方法

Nuclear Analysis Pub Date : 2022-06-01 DOI: 10.1016/j.nucana.2022.100009

Jianguo Qin , Yaping Zhang , Chuanxin Zhu , Caifeng Lai , Kai Li , Tonghua Zhu , Li An , Xinxin Lu , Yunfeng Mu

{"title":"A method for quickly subtracting the contributions from 182Ta and 94Nb in activity measurement of 93mNb in reactor neutron environment","authors":"Jianguo Qin , Yaping Zhang , Chuanxin Zhu , Caifeng Lai , Kai Li , Tonghua Zhu , Li An , Xinxin Lu , Yunfeng Mu","doi":"10.1016/j.nucana.2022.100009","DOIUrl":"10.1016/j.nucana.2022.100009","url":null,"abstract":"<div>Niobium is one of the most important neutron dosimeters used outside of the reactor. Owing to the fluorescence effects of 182Ta and 94Nb radionuclides, it is a problem to quickly obtain the activity of 93mNb which produced by the neutron inelastic scattering of Nb. To solve this problem, a fast estimating method based on the Monte Carlo simulation is proposed. All the contributions from fluorescence effects that induced by gamma-rays, beta-rays and internal conversion electrons of the radionuclides in the niobium sample were considered. The comparison results demonstrated that the deviation is less than 8.0% between the calculated and the experimental activities. It shows that the contribution of radionuclide by fluorescence effects in activity measurement of the niobium sample can be subtracted quickly using this method, based just once experimental measurement.</div>","PeriodicalId":100965,"journal":{"name":"Nuclear Analysis","volume":"1 2","pages":"Article 100009"},"PeriodicalIF":0.0,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S277318392200009X/pdfft?md5=bd099c31c32008530bbaab49b7767d3d&pid=1-s2.0-S277318392200009X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80667289","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Preparation of novel zirconium phosphonates for adsorption of lutetium 新型磷酸锆吸附镥的制备

Nuclear Analysis Pub Date : 2022-06-01 DOI: 10.1016/j.nucana.2022.100010

Wanjun Mu, Baihua Chen, Xingliang Li, Hongyuan Wei, Yuchuan Yang, Shuming Peng

{"title":"Preparation of novel zirconium phosphonates for adsorption of lutetium","authors":"Wanjun Mu, Baihua Chen, Xingliang Li, Hongyuan Wei, Yuchuan Yang, Shuming Peng","doi":"10.1016/j.nucana.2022.100010","DOIUrl":"10.1016/j.nucana.2022.100010","url":null,"abstract":"<div>Separation and recovery of 177Lu from radioactive medicine waste is concerned due to its potential application in radiopharmaceuticals. In this paper, two zirconium phosphonate materials (Zr-AMTP-1 and Zr-AMTP-2) were prepared by water-bath and hydrothermal method, respectively, for separating Lu from acidic systems. Both of them exhibited similar sheet-morphology and the typical layered structure like α-ZrP, but Zr-AMTP-2 possessed a wider layered distance due to the existence of [(CH3)2NH2]+ in its inter-layers. Remarkably, both two materials exhibited much stronger ability for removal of Lu3+ in comparison with α-ZrP, especially in complicated acidic conditions. Notably, Zr-AMTP-2 possess a much higher adsorption capacity for Lu3+ (113.91 mg g−1) [almost twice that of Zr-AMTP-1 (60.53 mg g−1)], and quick adsorption rates, which are attributed to its wider layer distance and abundant [(CH3)2NH2]+exchange sites. In addition, both two materials have a high selectivity for Lu3+ in the mixture solution with the co-existing ions (K+, Na+ and NO3−). This work posed a new way to develop new adsorbents that could be application in radioactive medicine waste disposal.</div>","PeriodicalId":100965,"journal":{"name":"Nuclear Analysis","volume":"1 2","pages":"Article 100010"},"PeriodicalIF":0.0,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2773183922000106/pdfft?md5=be947893658b6cb55327da8523bef3fd&pid=1-s2.0-S2773183922000106-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81986353","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Review: Current progresses of small-angle neutron scattering on soft-matters investigation 综述:软物质小角中子散射研究进展

Nuclear Analysis Pub Date : 2022-06-01 DOI: 10.1016/j.nucana.2022.100011

Dong Liu , Kun Song , Wei Chen , Jie Chen , Guangai Sun , Liangbin Li

{"title":"Review: Current progresses of small-angle neutron scattering on soft-matters investigation","authors":"Dong Liu , Kun Song , Wei Chen , Jie Chen , Guangai Sun , Liangbin Li","doi":"10.1016/j.nucana.2022.100011","DOIUrl":"10.1016/j.nucana.2022.100011","url":null,"abstract":"<div>A review of the recent works on soft-matters based on small-angle neutron scattering (SANS) is presented. This Review is intended to be a relatively comprehensive source for applying SANS on soft-matters investigation, including the basic principles and theory, the major characteristics of the SANS such as chain labeling and contrast variation/matching based on hydrogen/deuterium replacement, as well as corresponding typical application examples. Through the demonstration of applications in sample systems such as polymer solutions, polymer blend, semi-crystalline polymer, polymer nano-composites, hydrogel, and bio-materials, the advantages of SANS on soft-matters are demonstrated. Specifically, examples of the recent SANS investigation on spectrometer SANS-Suanni of 20 MW China Mianyang Research Reactor (CMRR) were included. As the users of neutron facilities are increasing steeply along with newly established neutron sources as well as experienced ones, this Review is intended to be of interest to the SANS, soft matter, and nano-materials science communities.</div>","PeriodicalId":100965,"journal":{"name":"Nuclear Analysis","volume":"1 2","pages":"Article 100011"},"PeriodicalIF":0.0,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2773183922000118/pdfft?md5=89cc140aff84605ee4d9d56509e79bf8&pid=1-s2.0-S2773183922000118-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81119412","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 11

Complexation of uranyl with chelidamic acid: Crystal structures, binding strength, and electrochemical redoxes 螯合酸与铀酰的络合:晶体结构、结合强度和电化学氧化

Nuclear Analysis Pub Date : 2022-06-01 DOI: 10.1016/j.nucana.2022.100014

Xingliang Li, Wanjun Mu, Baihua Chen, Yao He, Jun Tu, Yuchuan Yang, Yanqiu Yang, Hongyuan Wei, Shuming Peng

{"title":"Complexation of uranyl with chelidamic acid: Crystal structures, binding strength, and electrochemical redoxes","authors":"Xingliang Li, Wanjun Mu, Baihua Chen, Yao He, Jun Tu, Yuchuan Yang, Yanqiu Yang, Hongyuan Wei, Shuming Peng","doi":"10.1016/j.nucana.2022.100014","DOIUrl":"https://doi.org/10.1016/j.nucana.2022.100014","url":null,"abstract":"<div>Chelidamic acid (denoted as H3L in this paper) is a naturally occurring derivative of dipicolinic acid that functions as a versatile ligand. The complex formation of chelidamic acid with UO22+ has been investigated by potentiometry in a 0.1 M NaClO4 solution. The potentiometry identified 1:1 uranyl–chelidamate complexes (UO2HL, UO2L2−), 1:2 uranyl–chelidamate complex (UO2L24−), and a hydrolytic complex UO2(OH)2L2−. The possible UO2H2L22− structure was determine by crystal analysis. Chelidamate molecules coordinate to uranyl mainly through the pyridine–carboxylate chelation pocket (O, N, O), and 4-pyridinol–OH group is protonated. The presence of hydrolysate UO2(OH)2L2– was further confirmed by nuclear magnetic resonance spectroscopy (NMR). In an alkaline aqueous medium under anaerobic conditions, the complex UVIO2(OH)2L2−can be electrochemically reduced to pentavalent uranyl.</div>","PeriodicalId":100965,"journal":{"name":"Nuclear Analysis","volume":"1 2","pages":"Article 100014"},"PeriodicalIF":0.0,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2773183922000143/pdfft?md5=9fbd00a5dc680969a085b352c57f7422&pid=1-s2.0-S2773183922000143-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"92064122","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0