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Koarai, Kazuma; Matsueda, Makoto; Watanabe, Yusuke; Terashima, Motoki
KEK Proceedings 2025-2 (Internet) , p.151 - 156, 2025/12
A rapid analytical method was applied to flatfish collected off the coast of Fukushima Prefecture for the determination of tissue free water tritium (TFWT) and OBT in different forms. Quantitative analysis and synchrotron radiation measurements of Re (analogue element of Tc) and stable I in seaweeds were carried out to develop a method for the analysis of Tc-99 and I-129 in seaweeds.
I in riverbank sediment after the Fukushima accidentNakanishi, Takahiro; Sakuma, Kazuyuki; Oyama, Takuya; Hagiwara, Hiroki; Suzuki, Takashi
Environmental Pollution, 355, p.124213_1 - 124213_7, 2024/08
Times Cited Count：8 Percentile：63.99(Environmental Sciences)This study investigated the transport behavior of I by riverbank surveys conducted from 2013 to 2015 in a watershed where the I/
Cs activity ratio is low in the mountainous area and high in the plain as of 2011. Until 2015, the I/Cs activity ratio of the levee crown in the studied watershed was similar to that of the surrounding area in 2011. However, the I/Cs ratios of the surface riverbank sediments were all low, indicating that radionuclides transported from the mountainous area were deposited on the riverbank in the plain. The vertical distribution of the I/Cs ratio in the riverbank sediments indicated that some I and Cs deposited during the accident remained in the lower layers, but most were eroded immediately after the accident. Based on the I/Cs ratios of sediments deposited on the riverbank, which remained constant until 2015 after the accident, the amount of I discharged to the ocean was determined from the previously evaluated Cs discharge. It was calculated that 1.8
10
Bq and 1.210
Bq of I were discharged with sediment from the studied watershed and the contaminated river watersheds (Abukuma River and Fukushima coastal rivers, including the study river), respectively. The results of this study indicate that the continuous I discharge from the river contribute little to their amount in the seafloor sediments along the Fukushima coast.
Kuwabara, Jun; Kinoshita, Naoki; Tobinai, Kazuhito; Matsuno, Satoru; Oyokawa, Atsushi; Seki, Takeo; Yabuuchi, Noriaki
Dai-28-Kai Tandemu Kasokuki Oyobi Sono Shuhen Gijutsu No Kenkyukai Hokokushu, p.77 - 79, 2015/12
A Tandetron AMS system (JAEA-AMS-MUTSU) at Mutsu Office, Aomori Research and Development Center, Sector of Decommissioning and Radioactive Waste Management, JAEA, installed in 1997, has composed of 3 MV tandem accelerator and two beam lines (carbon and iodine). Status of the JAEA-AMS-MUTSU and trouble of ion source caused by deterioration of optical fiber cable are reported.
Suzuki, Takashi; Aramaki, Takafumi*; Kitamura, Toshikatsu; Togawa, Orihiko
Dai-16-Kai Tandemu Kasokuki Oyobi Sono Shuhen Gijutsu No Kenkyukai Hokokushu, p.162 - 165, 2004/02
no abstracts in English
Kitamura, Toshikatsu; Togawa, Orihiko; Aramaki, Takafumi; Suzuki, Takashi; Mizutani, Yoshihiko*; Kabuto, Shoji*; Sudo, Kazuhiko*
JNC TN7200 2001-001, p.31 - 34, 2002/01
no abstracts in English
Gottdang, A.*; Klein, M.*; Mous, D. J. W.*; Kitamura, Toshikatsu; Mizutani, Yoshihiko*; Suzuki, Takashi; Aramaki, Takafumi; Togawa, Orihiko; Kabuto, Shoji*; Sudo, Kazuhiko*
AIP Conference Proceedings 576, p.403 - 406, 2001/00
no abstracts in English
Mineo, Hideaki; Uchiyama, Gunzo; Hotoku, Shinobu; Asakura, Toshihide; Kihara, Takehiro; ; ; Kimura, Shigeru; ; ; et al.
Proc. of Int. Conf. on Future Nuclear Systems (GLOBAL'99)(CD-ROM), 7 Pages, 1999/00
no abstracts in English
Sakurai, Tsutomu;
JAERI-Review 97-002, 62 Pages, 1997/02
JAERI-Review-97-002.pdf:2.51MB
no abstracts in English
I/
I ratio and present status of JAEA-AMS-TONOOkabe, Nobuaki; Fujita, Natsuko; Watanabe, Takahiro; Kokubu, Yoko
no journal, ,
no abstracts in English
Terada, Hiroaki
no journal, ,
no abstracts in English
Matsueda, Makoto; Aoki, Jo; Koarai, Kazuma; Terashima, Motoki; Takagai, Yoshitaka*
no journal, ,
Long half-life I have provided important information as a tracer to estimate the environmental behaviour of radioisotopes released from nuclear facilities. Inductively coupled plasma-mass spectrometry (ICP-MS) is capable of rapid data acquisition, but the application is limited caused by the main interferences at m/z 129 (IH
and Xe). It has been reported that Xe can be removed by introducing O gas into the reaction cell in an ICP-MS. Tandem mass spectrometry (ICP-MS/MS) has also made it possible to suppress the formation of IH. However, more precise removal of interferences is required to apply various environmental samples. In this study, the gas-phase reactions between I and interferents were investigated in a reaction cell of an ICP-MS/MS. The results showed that introducing an O-CO gas mixture into the reaction cell reduced the background counts of m/z 129 to a minimum level.
Yanagisawa, Kayo; Matsueda, Makoto; Kawakami, Tomohiko*; Furukawa, Makoto*; Takagai, Yoshitaka*
no journal, ,
no abstracts in English
