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鈴木 翔太郎*; 天野 洋典*; 榎本 昌宏*; 松本 陽*; 守岡 良晃*; 佐久間 一幸; 鶴田 忠彦; 帰山 秀樹*; 三浦 輝*; 津旨 大輔*; et al.
Science of the Total Environment, 831, p.154670_1 - 154670_15, 2022/07
被引用回数:2 パーセンタイル:13.83(Environmental Sciences)The monthly monitoring data (total 3647 samples) between May. 2011 and Mar. 2020 were analyzed to describe temporal variability of Cs concentration in coastal sediments off Fukushima.
Cs concentration of sediment had decreasing trend, but non-linear model fitting suggested that this decreasing trend showed slower. Additionally,
Cs concentration were up to 4.08 times greater in shallow sampling sites (7, 10, 20 m depth) following heavy rainfall events (before five months vs. after five months), such as typhoons. These were consistent with increasing particulate
Cs (P-
Cs) fluxes from river and increasing dissolved
Cs (D-
Cs) concentration in seawater. Finally, the numerical experiment was conducted and revealed that riverine
Cs input could preserve
Cs concentration in coastal sediment. These results indicate that riverine
Cs input via heavy rainfall events is one of the main factors for preserving
Cs concentration in coastal sediment off Fukushima.
坂中 章悟*; 明本 光生*; 青戸 智浩*; 荒川 大*; 浅岡 聖二*; 榎本 収志*; 福田 茂樹*; 古川 和朗*; 古屋 貴章*; 芳賀 開一*; et al.
Proceedings of 1st International Particle Accelerator Conference (IPAC '10) (Internet), p.2338 - 2340, 2010/05
日本においてERL型放射光源を共同研究チームで提案している。電子銃,超伝導加速空洞などの要素技術開発を進めている。また、ERL技術の実証のためのコンパクトERLの建設も進めている。これら日本におけるERL技術開発の現状について報告する。
坂中 章悟*; 吾郷 智紀*; 榎本 収志*; 福田 茂樹*; 古川 和朗*; 古屋 貴章*; 芳賀 開一*; 原田 健太郎*; 平松 成範*; 本田 融*; et al.
Proceedings of 11th European Particle Accelerator Conference (EPAC '08) (CD-ROM), p.205 - 207, 2008/06
コヒーレントX線,フェムト秒X線の発生が可能な次世代放射光源としてエネルギー回収型リニアック(ERL)が提案されており、その実現に向けた要素技術の研究開発が日本国内の複数研究機関の協力のもと進められている。本稿では、ERL放射光源の研究開発の現状を報告する。
鈴木 翔太郎*; 佐久間 一幸; 鶴田 忠彦; 松本 陽*; 天野 洋典*; 榎本 昌宏*; 守岡 良晃*; 神山 享一*; 高田 兵衛*
no journal, ,
To evaluate contribution of riverine particulate Cs input, we estimated
Cs concentration coastal sediment (7-20 m depth) with particulate
Cs flux of the total 13 rivers (Uda, Mano, Niida, Ohta, Odaka, Ukedo(+Takase), Maeda, Kuma, Tomioka, Ide, Kido, Natsui, Same) calculated by tank model for water discharge and empirical equations for suspended solids fluxes and
Cs discharge between May 2011 and March 2020. Calculated particulate
Cs flux from the river were ranged from 2.11
10
to 4979
10
Bq/month. Estimated
Cs concentration including particulate
Cs via deposition kept concentration level more than minimum 0.351 Bq/kg-dry when initial
Cs concentration, variation rate and deposition ratio were set 300 Bq/kg-dry, -95% and 0.1, respectively.