Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Taniguchi, Takumi; Matsumoto, Saori; Hiraki, Yoshihisa; Sato, Junya; Fujita, Hideki*; Kaneda, Yoshihisa*; Kuroki, Ryoichiro; Osugi, Takeshi
JAEA-Review 2024-059, 20 Pages, 2025/03
JAEA-Review-2024-059.pdf:1.0MB
The basic performance required for solidifying waste into cement, such as fluidity before curing and strength after curing, is expected to be affected by the chemical effects of substances and components contained in the waste. The fluidity before curing and the strength properties after curing are greatly influenced by the curing speed of the cement. We investigated existing knowledge with a focus on chemical substances that affect the curing speed of cement. In this report, chemical substances that affect fluidity are broadly classified into inorganic substances such as (1) anion species, (2) metal elements such as heavy metals, (3) inorganic compounds as cement admixtures, and (4) organic compounds as cement admixtures. Based on the investigation, we actually added chemicals and measured the setting time. As a result, it was found that there are multiple mechanisms contributing to accelerated hardening. We investigated chemical substances that inhibit the curing reaction of cement, and were able to compile information to consider ingredients that are contraindicated in cement curing.
Sayato, Natsuki; Otsuka, Kaoru; Fuyushima, Takumi; Endo, Yasuichi; Otsuka, Noriaki; Kitagishi, Shigeru; Tobita, Masahiro*; Isozaki, Futoshi*; Matsumoto, Satoshi*; Takemoto, Noriyuki
JAEA-Technology 2024-016, 247 Pages, 2025/02
JAEA-Technology-2024-016.pdf:28.43MB
Japan Materials Testing Reactor (JMTR, 50MW) was selected as a project to be subsidized by the Ministry of Education, Culture, Sports, Science and Technology (MEXT) for the "Establishment of an International Research and Development Center through Advanced Utilization of the World's Most Advanced Research Reactor". As part of this project, JMTR has installed "LWR Water Environment Simulation Tests" since 2010. This facility can control temperature, pressure, and water quality (dissolved oxygen, dissolved hydrogen, etc.) to simulate the water environment of light water reactors (BWR and PWR) and perform neutron irradiation of in-core structural materials, etc. In addition, this facility is also designed for PWR conditions. Chemical injection system for adding boron and lithium was added to the facility for PWR conditions. After the equipment was installed, test operation was carried out to confirm the performance of the facility. This report summarizes the establishment and test operation of LWR Water Environment Simulation Tests after the establishment.
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：3 Percentile：60.63(Biology)
-humate complexesMarumo, 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：24.48(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：60.35(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：18 Percentile：75.50(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：23 Percentile：73.49(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：69.88(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：49 Percentile：87.67(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：54.47(Physics, Multidisciplinary)no abstracts in English
Ozaki, Hirokazu*; Hayashi, Seiji*; Yoshimura, Kazuya; Katayose, Yuji*; Matsumoto, Takumi*; Asaoka, Yoshihiro*
no journal, ,
no abstracts in English
Matsumoto, Saori; Kuramochi, Ryo*; Shimizu, Koki; Sato, Junya; Taniguchi, Takumi; Kuroki, Ryoichiro; Okada, Takashi; Yoshida, Yukihiko; Osugi, Takeshi
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
Shimizu, Koki; Kuramochi, Ryo*; Enomoto, Mayu*; Matsumoto, Saori; Taniguchi, Takumi; Kuroki, Ryoichiro; Okada, Takashi; Yoshida, Yukihiko; Osugi, Takeshi
no journal, ,
no abstracts in English
Cs concentration in river water following the Fukushima nuclear accident in FY 2015-2017Nakanishi, 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
Takahashi, Yuta; Matsumoto, Saori; Taniguchi, Takumi; Kuroki, Ryoichiro; Okada, Takashi; Yoshida, Yukihiko; Osugi, Takeshi
no journal, ,
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
