Progress in Nuclear Science and Technology最新文献_第9页

Interaction studies between U-Zr alloy system and ceramic plasma-spray coated layer at elevated temperature 高温下U-Zr合金体系与陶瓷等离子喷涂层的相互作用研究

Progress in Nuclear Science and Technology Pub Date : 2018-11-01 DOI: 10.15669/PNST.5.192

Ki-hwan Kim, Ki-Won Hong, H. Song, S. Oh, J. Park

引用次数: 0

Sorption parameter setting approaches for radioactive waste disposal considering perturbation effects: sorption reduction factors for organics 考虑扰动效应的放射性废物处理的吸附参数设置方法:有机物的吸附还原因子

Progress in Nuclear Science and Technology Pub Date : 2018-11-01 DOI: 10.15669/PNST.5.229

Y. Tachi, M. Ochs

{"title":"Sorption parameter setting approaches for radioactive waste disposal considering perturbation effects: sorption reduction factors for organics","authors":"Y. Tachi, M. Ochs","doi":"10.15669/PNST.5.229","DOIUrl":"https://doi.org/10.15669/PNST.5.229","url":null,"abstract":"Various types of post-accident radioactive waste have been generated from cleanup and decommissioning activities at the Fukushima Daiichi nuclear power plant. Perturbation effects resulting from co-existing substances may influence radionuclide sorption. For the disposal of these wastes, perturbation effects on sorption parameters must be critically evaluated for the safety assessment of the disposal systems. The present study focuses on developing a methodology to quantify sorption parameters in the presence of such perturbation effects and on illustrating example calculations regarding sorption reduction factors (SRFs) due to the presence of organic ligands (ISA; isosaccharinic acid) for cement systems. Three approaches for the derivation of SRFs; 1) semi-quantitative estimation based on analogy with solubility enhancement factors (SEFs) derived from measured solubility, 2) prediction based on radionuclide speciation calculation, and 3) quantification from experimental sorption data in ternary systems were coupled and tested for the Am-ISA-cement system. Our approach allows to critically evaluate the dependence of sorption reduction factors for various perturbed systems on the chosen method of quantification, in accordance with the data availability for a given perturbation.","PeriodicalId":20706,"journal":{"name":"Progress in Nuclear Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82662185","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Characteristics of TPDN/SiO2-P adsorbent for MA(III) recovery TPDN/SiO2-P吸附剂回收MA(III)的特性

Progress in Nuclear Science and Technology Pub Date : 2018-11-01 DOI: 10.15669/PNST.5.61

H. Kofuji, Sou Watanabe, M. Takeuchi, Hideya Suzuki, T. Matsumura, H. Shiwaku, T. Yaita

引用次数: 3

A first-principles study on point defects in plutonium dioxide 二氧化钚点缺陷的第一性原理研究

Progress in Nuclear Science and Technology Pub Date : 2018-11-01 DOI: 10.15669/PNST.5.132

Hiroki Nakamura, M. Machida

引用次数: 2

A study of cerium extraction kinetics by TODGA in acidified and non-acidified organic solvent phases in the context of fission product management 裂变产物管理下酸化和非酸化有机溶剂相萃取铈动力学的TODGA研究

Progress in Nuclear Science and Technology Pub Date : 2018-11-01 DOI: 10.15669/PNST.5.70

Michael A. Bromley, C. Boxall

引用次数: 2

Chemical state analysis of simulated corium debris by EXAFS 用EXAFS分析模拟堆芯碎片的化学状态

Progress in Nuclear Science and Technology Pub Date : 2018-11-01 DOI: 10.15669/PNST.5.200

Y. Okamoto, M. Takano

引用次数: 4

Retention of uranium in cement systems: effects of cement degradation and complexing ligands 铀在水泥体系中的保留:水泥降解和络合配体的影响

Progress in Nuclear Science and Technology Pub Date : 2018-11-01 DOI: 10.15669/PNST.5.208

M. Ochs, B. Vriens, Y. Tachi

引用次数: 6

The discovery of element 117 (INVITED) 117号元素的发现(特邀)

Progress in Nuclear Science and Technology Pub Date : 2018-11-01 DOI: 10.15669/PNST.5.14

J. Roberto

{"title":"The discovery of element 117 (INVITED)","authors":"J. Roberto","doi":"10.15669/PNST.5.14","DOIUrl":"https://doi.org/10.15669/PNST.5.14","url":null,"abstract":"In November 2016, four new chemical elements, nihonium (Nh, Z=113), moscovium (Mc, Z=115), tennessine (Ts, Z=117), and oganesson (Og, Z=118) joined the periodic table. Elements 117 and 118 are the highest atomic numbers Z reached to date, and the A=294 isotopes of these elements are the heaviest nuclei ever synthesized. The existence of these elements, together with a consistent trend of increasing lifetimes for superheavy isotopes as neutron number N increases, provide strong evidence for the long sought “island of stability” for superheavy nuclei as the nuclear shell closure at N=184 is approached. Mc, Ts, and Og were discovered using the hot fusion process, bombarding actinide targets with intense beams of doubly-magic Ca ions at the Dubna Gas-Filled Recoil Separator at the Joint Institute for Nuclear Research in Russia. For element 117, a berkelium target from Oak Ridge National Laboratory (ORNL) was required. The berkelium was produced by intense neutron irradiation at ORNL’s High Flux Isotope Reactor and chemically separated at the adjoining Radiochemical Engineering Development Center. The Bk + Ca reaction produced two isotopes of element 117 with atomic weights A=293 and 294. These isotopes decayed into ten additional heaviest isotopes of elements 115, 113, 111, 109, 107, and 105, all closer to the predicted island of stability than previously achieved. The discovery of element 117 will be described together with results of other recent experiments in superheavy element research in the context of the critical importance of actinide target materials, implications for the periodic table and the island of stability, and opportunities to synthesize even heavier nuclei, including heavy isotopes of element 118 and new elements 119 and 120.","PeriodicalId":20706,"journal":{"name":"Progress in Nuclear Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90259959","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Nitrous acid-driven reduction of vanadium as a neptunium analogue 硝酸驱动的钒作为镎类似物的还原

Progress in Nuclear Science and Technology Pub Date : 2018-11-01 DOI: 10.15669/PNST.5.37

M. Chimes, C. Boxall, S. Edwards, M. Sarsfield, R. Taylor, D. Woodhead

{"title":"Nitrous acid-driven reduction of vanadium as a neptunium analogue","authors":"M. Chimes, C. Boxall, S. Edwards, M. Sarsfield, R. Taylor, D. Woodhead","doi":"10.15669/PNST.5.37","DOIUrl":"https://doi.org/10.15669/PNST.5.37","url":null,"abstract":"Neptunium has been previously shown to present challenges within a used nuclear fuel reprocessing scheme due to its tendency to exist in the (IV), (V), and (VI) oxidation states simultaneously. In order to control this neptunium speciation, and informed by relevant work in the literature, we are currently engaged in a study of nitric/nitrous acid redox chemistry with Np(V) and Np(VI). To minimize radiological exposure risks, we are also exploring the validity of using vanadium as an analogue for the study of the kinetics of the Np(VI)/Np(V) reduction by nitrous acid. The kinetics of the reduction of vanadium(V) by nitrous acid in solutions of nitric acid was investigated spectrophotometrically by the method of initial rates. Orders of reaction with respect to V(V), and HNO2 were found to be 0.90, and 1.24 respectively, in reasonable agreement with the analogous reaction orders for the reduction of Np(VI) by nitrous acid previously reported by Precek and Paulenova – suggesting that, for this particular reduction, V(V) can serve as a good kinetic analogue for Np(VI). The value of the rate constant k for the rate law -d[V(V)]/dt = k[V(V)][HNO2]/[H] was found to be 7.5 × 10 M s at 20 °C, two orders of magnitude smaller than that for the reduction of Np(VI) by HNO2, a difference that is attributable to the loss of one of the oxygens during the VO2 to VO reduction reaction.","PeriodicalId":20706,"journal":{"name":"Progress in Nuclear Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77555111","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Magnetization study on the ising ferromagnet URhGe with high-precision angle-resolved magnetic field near the hard axis 硬轴附近高精度角分辨磁场的超强铁磁体的磁化研究

Progress in Nuclear Science and Technology Pub Date : 2018-11-01 DOI: 10.15669/PNST.5.123

S. Nakamura, T. Sakakibara, Y. Shimizu, S. Kittaka, Y. Kono, Y. Haga, J. Pospíšil, E. Yamamoto

引用次数: 1