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Analytical method for the determination of $$^{211}$$At using an $$alpha$$-scintillation-camera system and thin-layer chromatography

瀬川 麻里子; 西中 一朗*; 藤 暢輔; 前田 亮

Journal of Radioanalytical and Nuclear Chemistry, 326(1), p.773 - 778, 2020/10

 被引用回数:0 パーセンタイル:100(Chemistry, Analytical)

$$^{211}$$At is a candidate nuclide for alpha-targeted therapy. In order to use $$^{211}$$At as a pharmaceutical, the radioactivity and chemical forms of generated $$^{211}$$At are the most fundamental specifications that need to be analyzed prior to its medical use. However, previous methods of separately measuring the radioactivity and chemical forms are not adaptable to the medical use of $$^{211}$$At because they cause a severe loss of $$^{211}$$At and do not analyze all the chemical forms of $$^{211}$$At. Therefore, a new analytical method for both the radioactivity and chemical forms of generated $$^{211}$$At is urgently needed. Accordingly, in this study, we developed an experimental system optimized to simultaneously analyze both the radioactivity and chemical forms of a $$^{211}$$At solution to significantly shorten the analysis time; we experimentally verified the accuracy and capabilities of this system at the Japan Atomic Energy Agency. The experiments confirmed that the present system could analyze the radioactivity and all the chemical forms of $$^{211}$$At with an uncertainty of approximately 5% in the region higher than 150 Bq and that it was 200 times more sensitive than the conventional method using an imaging technique with an X-ray imaging plate. As a result, a new method for analyzing the radioactivity and chemical forms of $$^{211}$$At was successfully established and this method will meet the demands for alpha-targeted therapy using $$^{211}$$At. This method will contribute to promoting the stable supply of the medical use of $$^{211}$$At in the near future.


Measurement of cesium isotopic ratio by thermal ionization mass spectrometry for neutron capture reaction studies on $$^{135}$$Cs

芝原 雄司*; 中村 詔司; 上原 章寛*; 藤井 俊行*; 福谷 哲*; 木村 敦; 岩本 修

Journal of Radioanalytical and Nuclear Chemistry, 325(1), p.155 - 165, 2020/07

 被引用回数:0 パーセンタイル:100(Chemistry, Analytical)



Sorption behavior of selenide on montmorillonite

杉浦 佑樹; 戸村 努*; 石寺 孝充; 土井 玲祐; Francisco, P. C. M.; 塩飽 秀啓; 小林 徹; 松村 大樹; 高橋 嘉夫*; 舘 幸男

Journal of Radioanalytical and Nuclear Chemistry, 324(2), p.615 - 622, 2020/05

 被引用回数:0 パーセンタイル:100(Chemistry, Analytical)

Batch sorption experiments were performed to investigate the sorption mechanism of Se on montmorillonite under reducing conditions in deep geological environments. Based on Eh-pH diagrams and ultraviolet-visible spectra, Se was dissolved as selenide (Se(-II)) anions under the experimental conditions. The distribution coefficients ($$K_{rm d}$$; m$$^{3}$$ kg$$^{-1}$$) of Se(-II) indicated ionic strength independence and slight pH dependence. The $$K_{rm d}$$ values of Se(-II) were higher than those of Se(IV), which also exists as an anionic species. X-ray absorption near edge spectroscopy showed that the oxidation state of Se-sorbed on montmorillonite was zero even though selenide remained in the solution. These results suggest that Se(-II) was oxidized and precipitated on the montmorillonite surface. Therefore, it is implied that a redox reaction on the montmorillonite surface contributed to high $$K_{rm d}$$ values for Se(-II).


Cesium concentrations in various environmental media at Namie, Fukushima

Heged$"u$s, M.*; 城間 吉貴*; 岩岡 和輝*; 細田 正洋*; 鈴木 崇仁*; 玉熊 佑紀*; 山田 椋平; 辻口 貴清*; 山口 平*; 小倉 功也*; et al.

Journal of Radioanalytical and Nuclear Chemistry, 323(1), p.197 - 204, 2020/01

 被引用回数:1 パーセンタイル:100(Chemistry, Analytical)



Improvement in flow-sheet of extraction chromatography for trivalent minor actinides recovery

渡部 創; 先崎 達也; 柴田 淳広; 野村 和則; 竹内 正行; 中谷 清治*; 松浦 治明*; 堀内 勇輔*; 新井 剛*

Journal of Radioanalytical and Nuclear Chemistry, 322(3), p.1273 - 1277, 2019/12

 被引用回数:0 パーセンタイル:100(Chemistry, Analytical)

Extraction chromatography flow-sheet employing octyl(phenyl)-$$N,N$$-diisobutylcarbonoylmethylphosphine oxide (CMPO) and $$bis$$(2-ethylhexyl) hydrogen phosphate (HDEHP) extractants for trivalent minor actinide recovery was modified to improve column separation performance. Excellent trivalent minor actinides recovery performance was obtained by column separation experiments on nitric acid solution containing the trivalent minor actinides and representative fission product elements, i.e. recovery yields $$>$$ 93% with sufficient decontamination factors against the fission products. Those are the best performance which we have ever obtained by experiments inside hot cell.


Repeatability and reproducibility of measurements of low dissolved radiocesium concentrations in freshwater using different pre-concentration methods

栗原 モモ*; 保高 徹生*; 青野 辰雄*; 芦川 信雄*; 海老名 裕之*; 飯島 健*; 石丸 圭*; 金井 羅門*; 苅部 甚一*; 近内 弥恵*; et al.

Journal of Radioanalytical and Nuclear Chemistry, 322(2), p.477 - 485, 2019/11

 被引用回数:0 パーセンタイル:100(Chemistry, Analytical)



Studies on processes for recovering uranium from sediment wastes

大橋 裕介; 池田 泰久*

Journal of Radioanalytical and Nuclear Chemistry, 321(2), p.683 - 691, 2019/08

 被引用回数:0 パーセンタイル:100(Chemistry, Analytical)



Optimization of an isothermal gas-chromatographic setup for the chemical exploration of dubnium (Db, Z = 105) oxychlorides

Chiera, N. M.; 佐藤 哲也; 富塚 知博; 浅井 雅人; 伊藤 由太; 白井 香里*; 鈴木 颯人; 床井 健運; 豊嶋 厚史; 塚田 和明; et al.

Journal of Radioanalytical and Nuclear Chemistry, 320(3), p.633 - 642, 2019/06

 被引用回数:0 パーセンタイル:100(Chemistry, Analytical)



Low $$^{137}$$Cs retention capability of organic layers in Japanese forest ecosystems affected by the Fukushima nuclear accident

小嵐 淳; 安藤 麻里子

Journal of Radioanalytical and Nuclear Chemistry, 320(1), p.179 - 191, 2019/04

 被引用回数:5 パーセンタイル:8.35(Chemistry, Analytical)



Secondary radiocesium contamination of agricultural products by resuspended matter

二瓶 直登*; 吉村 和也; 奥村 大河*; 田野井 慶太朗*; 飯島 和毅; 小暮 敏博*; 中西 友子*

Journal of Radioanalytical and Nuclear Chemistry, 318(1), p.341 - 346, 2018/10

 被引用回数:1 パーセンタイル:75.54(Chemistry, Analytical)

Komatsuna (${it Brassica rapa L.}$) was cultivated in pots using non-contaminated soil and water, and the pots were arranged 30, 60, and 120 cm above the ground surface. The experiment site was located 4.5 km from the Fukushima Daiichi Nuclear Power Plant and had an ambient dose rate of approximately 1.4 $$mu$$Sv/h. The radiocesium concentration in the above ground parts without washing ranged from 22 to 333 Bq/kg (dry weight). The radiocesium concentration in the washed plants was predominantly lower than in the un-washed plants. Komatsuna cultivated lower to the ground tended to have a higher radiocesium concentration. Therefore, it can be posited that radiocesium detected in Komatsuna leaves was derived from ground surface.


Correlation between Am(III)/Eu(III) selectivity and covalency in metal-chalcogen bonds using density functional calculations

金子 政志; 渡邉 雅之

Journal of Radioanalytical and Nuclear Chemistry, 316(3), p.1129 - 1137, 2018/06

 被引用回数:5 パーセンタイル:21.94(Chemistry, Analytical)

マイナーアクチノイドとランタノイドの分離メカニズムを理解することを目的として、カルコゲンをドナーとして持つ配位子N(EPMe$$_{2}$$)$$_{2}$$$$^{-}$$ (E = O, S, Se, Te)によるAm(III)イオンとEu(III)イオンの選択性を密度汎関数法によって予測した。単結晶構造に基づいて錯体をモデル化し、錯生成による金属イオンの安定化エネルギーを見積もった。その結果、OドナーはAm(III)イオンよりもEu(III)イオンと選択的に錯生成し、S, Se, TeドナーはEu(III)イオンよりもAm(III)イオンと選択的に錯生成する結果となった。この傾向は、HSAB則におけるソフト酸の分類と一致した。金属とカルコゲンの化学結合解析の結果、Am(III)イオンのf軌道との共有結合性が高いドナーほど、Am(III)イオンに対する選択性が高くなることを示唆した。


Am, Cm recovery from genuine HLLW by extraction chromatography

渡部 創; 佐野 雄一; 小藤 博英; 竹内 正行; 柴田 淳広; 野村 和則

Journal of Radioanalytical and Nuclear Chemistry, 316(3), p.1113 - 1117, 2018/06

 被引用回数:3 パーセンタイル:40.19(Chemistry, Analytical)

Am(III) and Cm(III) recovery experiments with the extraction chromatography technology were carried out on genuine HLLW obtained by reprocessing of the Fast Reactor fuel. Modification of the flow-sheet with 2 steps column operations using CMPO/SiO$$_{2}$$-P and HDEHP/SiO$$_{2}$$-P adsorbents achieved more than 90% recovery yields for Am(III) and Cm(III) with decontamination factor of 1000 for Eu(III). This is a significant progress in development of the technology for the implementation.


Radiation-induced degradation of aqueous 2-chlorophenol assisted by zeolites

熊谷 友多; 木村 敦*; 田口 光正*; 渡邉 雅之

Journal of Radioanalytical and Nuclear Chemistry, 316(1), p.341 - 348, 2018/04

 被引用回数:0 パーセンタイル:100(Chemistry, Analytical)



Overall approaches and experiences of first-time participants in the Nuclear Forensics International Technical Working Group's Fourth Collaborative Material Exercise (CMX-4)

Ho, D. M. L.*; Nelwamondo, A. N.*; 大久保 綾子; Rameb$"a$ck, H.*; Song, K.*; Han, S.-H.*; Hancke, J. J.*; Holmgren, S.*; Jonsson. S.*; 片岡 修; et al.

Journal of Radioanalytical and Nuclear Chemistry, 315(2), p.353 - 363, 2018/02

 被引用回数:0 パーセンタイル:100(Chemistry, Analytical)



The Application of radiochronometry during the 4th collaborative materials exercise of the nuclear forensics international technical working group (ITWG)

Kristo, M. J.*; Williams, R.*; Gaffney, A. M.*; Kayzar-Boggs, T. M.*; Schorzman, K. C.*; Lagerkvist, P.*; Vesterlund, A.*; Rameb$"a$ck, H.*; Nelwamondo, A. N.*; Kotze, D.*; et al.

Journal of Radioanalytical and Nuclear Chemistry, 315(2), p.425 - 434, 2018/02

 被引用回数:4 パーセンタイル:29.78(Chemistry, Analytical)



Production of iodine radionuclides using $$^{7}$$Li ion beams

西中 一朗*; 横山 明彦*; 鷲山 幸信*; 牧井 宏之; 橋本 和幸*

Journal of Radioanalytical and Nuclear Chemistry, 314(3), p.1947 - 1965, 2017/12

 被引用回数:2 パーセンタイル:64.19(Chemistry, Analytical)

$$^{7}$$Li + $$^{nat}$$Sn反応により生成されるI, Te, Sn同位体の生成断面積を入射エネルギー24-59MeVの領域で測定した。得られた生成断面積のエネルギー依存性を統計模型計算の結果と比較することにより、各同位体の生成機構と崩壊様式の観点から完全・不完全融合反応の生成断面積への寄与を議論した。また、医学的に有用な$$^{123,124}$$Iの生成という観点から、様々なSn同位体と$$^{7}$$Liビームの組み合わせにより、$$^{123,124,125,126}$$I同位体がどの程度生成されるかを計算し、$$^{7}$$Li以外をビームとして用いた場合との比較を行った。


Development of determination method of $$^{93}$$Mo content in metal waste generated at the Japan Power Demonstration Reactor

島田 亜佐子; 大森 弘幸*; 亀尾 裕

Journal of Radioanalytical and Nuclear Chemistry, 314(2), p.1361 - 1365, 2017/11

 被引用回数:0 パーセンタイル:100(Chemistry, Analytical)



Sources of $$^{137}$$Cs fluvial export from a forest catchment evaluated by stable carbon and nitrogen isotopic characterization of organic matter

武藤 琴美; 安藤 麻里子; 小嵐 淳; 竹内 絵里奈; 西村 周作; 都築 克紀; 松永 武*

Journal of Radioanalytical and Nuclear Chemistry, 314(1), p.403 - 411, 2017/10

 被引用回数:9 パーセンタイル:13.35(Chemistry, Analytical)



Uranium age-dating using in-situ isotope ratios by thermal ionization mass spectrometry for nuclear forensics

大久保 綾子; 篠原 伸夫; 間柄 正明

Journal of Radioanalytical and Nuclear Chemistry, 314(1), p.231 - 234, 2017/10

 被引用回数:0 パーセンタイル:100(Chemistry, Analytical)



Separation of Zr in the rubble waste generated at the Fukushima Daiichi Nuclear Power Station

島田 亜佐子; 亀尾 裕

Journal of Radioanalytical and Nuclear Chemistry, 311(3), p.1613 - 1618, 2017/03


 被引用回数:0 パーセンタイル:100(Chemistry, Analytical)

福島第一原子力発電所の事故で発生したガレキ中の$$^{93}$$Zrを分析するために、ガレキ中のZrの分離法を開発した。ほぼ100%のZrとNb, Bi, Th, UとMoの一部は3M硝酸溶液からTRUレジンに抽出され、LiやBe, Mg, Al, Ca, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, As, Se, Rb, Sr, Ag, Cd, In, Cs, Baは溶出することでこれらの元素が分離された。ほぼ100%のZrとNb, U、10%のMo、7.1%のHg、77%のBi、20%のThが0.01Mフッ化水素酸により回収された。超寿命核種である$$^{93}$$ZrをICP-MSにより定量するためには、ZrはNbやMoから分離されなければならない。そのため、この回収フラクションを一度乾固した後、0.1Mフッ化水素酸溶液に調製してTEVAレジンに通液し、ZrをNbやMoから分離した。模擬ガレキ試料の溶解液を用いてこの手法の妥当性を検証した。

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