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Shimada, Mikio*; Tokumiya, Takumi*; Miyake, Tomoko*; Tsukada, Kaima*; Kanzaki, Norie; Yanagihara, Hiromi*; Kobayashi, Junya*; Matsumoto, Yoshihisa*
Journal of Radiation Research (Internet), 64(2), p.345 - 351, 2023/03
Times Cited Count:0 Percentile:0.01(Biology)Marumo, Kazuki*; Matsumoto, Atsumasa*; Nakano, Sumika*; Shibukawa, Masami*; Saito, Takumi*; Haraga, Tomoko; Saito, Shingo*
Environmental Science & Technology, 53(24), p.14507 - 14515, 2019/12
Times Cited Count:7 Percentile:29.54(Engineering, Environmental)Humic acids (HA) are responsible for the fate of metal ions in the environment. We developed a polyacrylamide gel electrophoresis (PAGE) technique to investigate the MW distributions of metal ion (copper ion). Combining contaminant-metal-free and high-resolution PAGE systems for HA provided accurate MW distributions for the metal ions. Coupling this system with UV-Vis spectrometry and the excitation-emission matrix (EEM) spectrometry-parallel factor analysis (PARAFAC) method revealed new insights into metal-HA complex. Interestingly, the MW distributions of the three metal ions were entirely different, indicating that the presence of specific binding environments in HA for the metal ions depending its MW. The MW distributions of five fluorescent components were associated with the metal ion distributions. Our PAGE-based methodology suggests that metal binding sites and fluorescent components in HA exhibit heterogeneity in terms of metal binding affinity and MW.
Nakanishi, Takahiro; Sato, Seiji; Matsumoto, Takumi*
Radiation Protection Dosimetry, 184(3-4), p.311 - 314, 2019/10
Times Cited Count:8 Percentile:67.25(Environmental Sciences)There has been significant concern about an increase of exposure dose in living sphere due to the accumulation of radiocesium discharged from contaminated mountainous forest in Fukushima. In this study, we investigated the history of radiocesium deposition on some floodplains in Fukushima. Radiocesium concentrations of river suspended particles and air dose rates at floodplains were also observed continuously. In many situations, annual sediment accumulation at floodplains was only several kg m and its radiocesium concentration was gradually decreasing in line with that of suspended particle. Simultaneously, air dose rates on floodplains were decreasing with time. In 2015 with heavy flood discharge, several hundred kg m of sediment accumulation and sharply decrease of air dose rate was observed at rivers without reservoir. Conversely, radiocesium accumulation at floodplain was significant reduced due to deposition on upstream reservoir.
Yamamoto, Takumi; Uesugi, Yoshihiko; Kawashima, Hisato; Hoshino, Katsumichi; ; Kasai, Satoshi; Kawakami, Tomohide; Kondoh, Takashi; Maeda, Hikosuke; Matsuda, Toshiaki; et al.
Physical Review Letters, 63(11), p.1148 - 1151, 1989/09
Times Cited Count:17 Percentile:75.66(Physics, Multidisciplinary)no abstracts in English
Mori, Masahiro; Suzuki, Norio; Uesugi, Yoshihiko; Ogawa, Toshihide; Ogawa, Hiroaki; Otsuka, Hideo; Odajima, Kazuo; Kasai, Satoshi; Kawakami, Tomohide; Kawashima, Hisato; et al.
Nuclear Fusion, 28(10), p.1892 - 1897, 1988/10
Times Cited Count:22 Percentile:72.29(Physics, Fluids & Plasmas)no abstracts in English
Hoshino, Katsumichi; Yamamoto, Takumi; Suzuki, Norio; Kawashima, Hisato; Kasai, Satoshi; Kawakami, Tomohide; Maeda, Hikosuke; Matoba, Toru; Matsuda, Toshiaki; Matsumoto, Hiroshi; et al.
Nuclear Fusion, 28(2), p.301 - 306, 1988/00
Times Cited Count:22 Percentile:72.29(Physics, Fluids & Plasmas)no abstracts in English
Mori, Masahiro; Miura, Yukitoshi; Suzuki, Norio; Uesugi, Yoshihiko; Tamai, Hiroshi; Ogawa, Toshihide; Ogawa, Hiroaki; Otsuka, Hideo; Odajima, Kazuo; Kasai, Satoshi; et al.
JAERI-M 87-117, 13 Pages, 1987/08
no abstracts in English
Hoshino, Katsumichi; Yamamoto, Takumi; Suzuki, Norio; Kawashima, Hisato; Kasai, Satoshi; Kawakami, Tomohide; Maeda, Hikosuke; Matoba, Toru; Matsuda, Toshiaki; Matsumoto, Hiroshi; et al.
JAERI-M 87-096, 10 Pages, 1987/07
no abstracts in English
Sengoku, Seio; ; Hasegawa, Mitsuru; Hoshino, Katsumichi; Kasai, Satoshi; Kawakami, Tomohide; Kawashima, Hisato; Matoba, Toru; Matsuda, Toshiaki; Matsumoto, Hiroshi; et al.
Physical Review Letters, 59(4), p.450 - 453, 1987/00
Times Cited Count:48 Percentile:87.64(Physics, Multidisciplinary)no abstracts in English
Hoshino, Katsumichi; Odajima, Kazuo; Yamamoto, Takumi; Suzuki, Norio; Kawashima, Hisato; Yamauchi, Toshihiko; Uesugi, Yoshihiko; Kasai, Satoshi; Kawakami, Tomohide; Maeda, Hikosuke; et al.
Physics Letters A, 124(4-5), p.299 - 302, 1987/00
Times Cited Count:7 Percentile:54.65(Physics, Multidisciplinary)no abstracts in English
Haga, Yoshinori; Yamamoto, Etsuji; Tateiwa, Naoyuki; Matsuda, Tatsuma; Matsumoto, Yuji; Nakajima, Kunihisa; Sato, Takumi; Arai, Yasuo; Onuki, Yoshichika; Homma, Yoshiya*; et al.
no journal, ,
no abstracts in English
Nakanishi, Takahiro; Katayose, Yuji*; Osotsuka, Koji*; Haginoya, Takumi*; Matsumoto, Takumi*
no journal, ,
A large amount of radiocesium emitted from the Fukushima Daiichi Nuclear Power Plant (FDNPP) accident was deposited in terrestrial areas. It is therefore important to determine the quantity of radiocesium transported from these areas by hydrological processes to predict the future contamination status and propose effective countermeasures to reduce exposure. In this paper, we report the trend of the radiocesium concentration in 2 rivers nearby FDNPP and discuss the environmental factors on behavior of radiocesium.
Ozaki, Hirokazu*; Yoshimura, Kazuya; Katayose, Yuji*; Matsumoto, Takumi*; Asaoka, Yoshihiro*; Hayashi, Seiji*
no journal, ,
no abstracts in English
Ozaki, Hirokazu*; Hayashi, Seiji*; Yoshimura, Kazuya; Katayose, Yuji*; Matsumoto, Takumi*; Asaoka, Yoshihiro*
no journal, ,
no abstracts in English
Sato, Junya; Kuramochi, Ryo*; Shimizu, Koki; Matsumoto, Saori; Taniguchi, Takumi; Kuroki, Ryoichiro; Osugi, Takeshi
no journal, ,
no abstracts in English