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Fabrication of CeO2 microspheres by sol−gel reaction with polymerization via single emulsion 溶胶-凝胶反应-单乳液聚合法制备CeO2微球

Nuclear Analysis Pub Date : 2022-03-01 DOI: 10.1016/j.nucana.2022.100008

Jianxing Ma, Yuzhe Hong, Yueming Sun, Fei Peng

引用次数: 3

In-situ TEM study of loop evolution in FeCrAl alloy under Fe+ irradiation: Effects of temperatures, dislocations and precipitates Fe+辐照下feral合金环演化的原位TEM研究:温度、位错和析出相的影响

Nuclear Analysis Pub Date : 2022-03-01 DOI: 10.1016/j.nucana.2022.100001

Kefei Pei , Guang Ran , Yipeng Li , Ziqi Cao , Dewang Cui , Ruiqian Zhang , Gang Yang

{"title":"In-situ TEM study of loop evolution in FeCrAl alloy under Fe+ irradiation: Effects of temperatures, dislocations and precipitates","authors":"Kefei Pei , Guang Ran , Yipeng Li , Ziqi Cao , Dewang Cui , Ruiqian Zhang , Gang Yang","doi":"10.1016/j.nucana.2022.100001","DOIUrl":"10.1016/j.nucana.2022.100001","url":null,"abstract":"<div>Fe13.5Cr4.7Al alloy was irradiated in-situ with 400 keV Fe+ in TEM at RT and 748 K. The evolution of dislocation loops under the influence of temperatures, irradiation dose, dislocation lines and precipitates were characterized in detail. The loop rafting was found at RT irradiation for the first time and the growth direction of the rafted loops was along g = 110 direction. However, this phenomenon was not observed at 748 K and only the dislocation complex was appeared. The formation conditions of loop rafting were low temperature and a certain value of irradiation dose. The average size and number density of dislocation loops as a function of irradiation dose in the regions with dislocation lines, precipitates and no dislocation lines/precipitates were constructed and analyzed comparatively. At the same irradiation dose, sample irradiated at higher temperature has larger average loop size and lower loop number density. There was a complex interaction between dislocation line-loop at 748 K, but few interactions were observed at RT. At any irradiation dose, the loop number density in the region with dislocation lines was smaller than that in the region without dislocation lines, but the average loop size was slightly opposite. Moreover, the higher the irradiation temperature, the more obvious the effects of precipitates and dislocation lines on loop evolution were. Our current results provide a fundamental insight into how the dislocations, precipitates and dose affect loop evolution and characteristics in FeCrAl alloy at elevated temperatures.</div>","PeriodicalId":100965,"journal":{"name":"Nuclear Analysis","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2773183922000015/pdfft?md5=d054a3e10e4fbdd7e32ad4cef1d0bb57&pid=1-s2.0-S2773183922000015-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75232564","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: 3

Vertical and spatial distribution of plutonium and radio-cesium in lake sediment of China 中国湖泊沉积物中钚和放射性铯的垂直和空间分布

Nuclear Analysis Pub Date : 2022-03-01 DOI: 10.1016/j.nucana.2022.100004

Dongxia Feng , Meichen Ji , Haiqing Liao , Chaojun Lu , Fang Yang , Xingxuan Zhou , Shiqi Jia

{"title":"Vertical and spatial distribution of plutonium and radio-cesium in lake sediment of China","authors":"Dongxia Feng , Meichen Ji , Haiqing Liao , Chaojun Lu , Fang Yang , Xingxuan Zhou , Shiqi Jia","doi":"10.1016/j.nucana.2022.100004","DOIUrl":"10.1016/j.nucana.2022.100004","url":null,"abstract":"<div>Anthropogenic radionuclides of plutonium and 137Cs in the environment were usually applied for tracing the environmental impact of nuclear activities as well as establishing the chronology of recent lake sediment. In this study, the vertical distribution and spatial differentiation of plutonium and 137Cs in lake sediments of China were systematically contrastive analyzed to elucidate the regional influence by the local fallout from Chinese nuclear tests. The results demonstrated that the inventory of 137Cs and 239,240Pu, and their isotopic composition in lake sediments in northwestern China were obviously different from other regions, indicating that a portion of radionuclides in lakes in northwest China were originated from the Chinese Lop Nor Nuclear Test site (CNTs), and radionuclides in lakes of other regions may be completely originated from global fallout. Usually, the anthropogenic radionuclides recorded in lake sediments showed a single peak corresponding to the maximum deposition of 1964. However, two or three accumulation peaks of radionuclides were also observed in a few lakes. For the application of radionuclides on the dating of recent sediment, the accumulative peak of 239,240Pu and 137Cs signed to the period of 1963–1964 is the only practicable time marker for lake sediments in other regions of China. Isotopic information, such as 240Pu/239Pu ratio and 239,240Pu/137Cs activity ratio, may be useful for accurate sediment chronology, as well as used as a fingerprint to identify the source of the associated radioactive substance in the environment.</div>","PeriodicalId":100965,"journal":{"name":"Nuclear Analysis","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2773183922000040/pdfft?md5=998618bfbb2a3f1370d6b86f0e4c05f2&pid=1-s2.0-S2773183922000040-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89380028","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: 4

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