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Journal Articles

Mass-spectrometric determination of iodine-129 using O $_{2}$ -CO $_{2}$ mixed-gas reaction in inductively coupled plasma tandem quadrupole mass spectrometry

Matsueda, Makoto; Aoki, Jo; Koarai, Kazuma; Terashima, Motoki; Takagai, Yoshitaka*

Analytical Sciences, 38(11), p.1371 - 1376, 2022/11

https://doi.org/10.1007/s44211-022-00180-w

Times Cited Count：3 Percentile：29.37(Chemistry, Analytical)

The $^{129}$ I analysis using ICP-MS is challenging caused by xenon-129 ( $^{129}$ Xe) and $^{127}$ IH $_{2}$ generated from excess stable isotope $^{127}$ I. In this study, mass discrimination between iodine-129 ( $^{129}$ I) and interfering substances was achieved by inductively coupled plasma-tandem quadrupole mass spectrometry (ICP-MS/MS) with a dynamic reaction cell introduced a mixture gas of O $_{2}$ and CO $_{2}$ . As a result, the ratio of (background noise intensity at m/z 129)/ $^{127}$ I was 3.8 10 $^{-10}$ and 10 mBq/L of $^{129}$ I was analyzed without chemical separation in the presence of 100 mg/L stable $^{127}$ I. Spiked tests with actual rainwater were performed, and obtained values were agreed with the spiked amounts.

Journal Articles

$^{129}$ I/ $^{127}$ I and $^{14}$ C records in a modern coral from Rowley Shoals off northwestern Australia reflect the 20th-century human nuclear activities and ocean/atmosphere circulations

Mitsuguchi, Takehiro; Okabe, Nobuaki*; Yokoyama, Yusuke*; Yoneda, Minoru*; Shibata, Yasuyuki*; Fujita, Natsuko; Watanabe, Takahiro; Kokubu, Yoko

Journal of Environmental Radioactivity, 235-236, p.106593_1 - 106593_10, 2021/09

https://doi.org/10.1016/j.jenvrad.2021.106593

Times Cited Count：5 Percentile：33.8(Environmental Sciences)

For a contribution to developing the usage of iodine-129 ( $^{129}$ I) as a tracer of deep-seated fluid, $^{129}$ I/ $^{127}$ I and $^{14}$ C were measured for annual bands (AD 1931-1991) of a modern coral collected from Northwestern Australia; the measurements were performed using the JAEA-AMS-TONO-5MV for $^{129}$ I/ $^{127}$ I and an AMS facility of the University of Tokyo for $^{14}$ C. Results indicate that both $^{129}$ I/ $^{127}$ I and $^{14}$ C distinctly increase from 1950s. The $^{14}$ C increase can be ascribed to atmospheric nuclear tests, while the $^{129}$ I/ $^{127}$ I increase is due to nuclear-fuel reprocessing as well as atmospheric nuclear tests. These results are in good agreement with previous studies, indicating that the $^{129}$ I/ $^{127}$ I measurement by JAEA-AMS-TONO-5MV has been further developed.

Journal Articles

Penetration of $^{129}$ I released from Fukushima Daiichi Nuclear Power Plant accident in the western North Pacific Ocean

Suzuki, Takashi; Otosaka, Shigeyoshi; Kuwabara, Jun; Kawamura, Hideyuki; Kobayashi, Takuya

JAEA-Conf 2018-002, p.103 - 106, 2019/02

https://doi.org/10.11484/jaea-conf-2018-002

To investigate the dynamics of radionuclides in the ocean released by the accident at Fukushima Daiichi Nuclear Power Plant (1F), vertical distributions of $^{129}$ I at three stations in the western North Pacific was revealed. The 1F accident-derived $^{129}$ I existed within the mixed layer at 3 stations. The maximum layer of the 1F accident-derived $^{129}$ I existed at the depth of 370 m - 470 m at the most southern station. Considering the dissolved oxygen concentration and the current velocity arround the station, the maximum layer of the 1F accident-derived $^{129}$ I would be fromed that $^{129}$ I which existed in the surface seawater at other area of observation point was carried to the depth of 370 m - 470 m by the fast downward flow.

Journal Articles

Vertical distribution of $^{129}$ I released from the Fukushima Daiichi Nuclear Power Plant in the Kuroshio and Oyashio current areas

Suzuki, Takashi; Otosaka, Shigeyoshi; Kuwabara, Jun; Kawamura, Hideyuki; Kobayashi, Takuya

Marine Chemistry, 204, p.163 - 171, 2018/08

https://doi.org/10.1016/j.marchem.2018.07.007

Times Cited Count：2 Percentile：10.67(Chemistry, Multidisciplinary)

To investigate the penetration of radionuclides released from Fukushima Daiichi Nuclear Power Plant (FDNPP), depth profiles were revealed at Kuroshio current, transition, and Oyashio current areas. The FDNPP-derived $^{129}$ I was found in surface layer at Oyashio current and transition areas and in sub-surface layer at Kuroshio current area. Moreover, it was found that the FDNPP-derived $^{129}$ I/ $^{134}$ Cs ratios in the Oyashio current and transition areas were higher than that in the FDNPP reactor. The higher FDNPP-derived $^{129}$ I/ $^{134}$ Cs ratios suggest three potential mechanisms for the migration of radionuclides in the environment: (1) radioiodine was released more easily than radiocesium by the FDNPP accident, (2) $^{129}$ I was supplied from the atmosphere by re-emitted $^{129}$ I from contaminated areas around Fukushima, (3) leaked water that removed radiocesium reached the sampling stations. The FDNPP-derived $^{129}$ I in sub-surface layer would be transported by the meander of the Kuroshio Extension current.

Journal Articles

High sensitivity measurement of Iodine-129/Iodine-127 ratio by accelerator mass spectrometry

Suzuki, Takashi; Kitamura, Toshikatsu; Kabuto, Shoji*; Togawa, Orihiko; Amano, Hikaru

Journal of Nuclear Science and Technology, 43(11), p.1431 - 1435, 2006/11

https://doi.org/10.3327/jnst.43.1431

Times Cited Count：13 Percentile：65.77(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Measurement of iodine-129 by JAERI-AMS and its application to oceanography

Suzuki, Takashi; Kitamura, Toshikatsu; Togawa, Orihiko; Amano, Hikaru

UTNST-SMP-12, p.116 - 121, 2003/12

no abstracts in English

Journal Articles

An Advanced aqueous reprocessing process for the next generation's nuclear fuel cycle

Mineo, Hideaki; Asakura, Toshihide; Hotoku, Shinobu; Ban, Yasutoshi; Morita, Yasuji

Proceedings of GLOBAL2003 Atoms for Prosperity; Updating Eisenhower's Global Vision for Nuclear Energy (CD-ROM), p.1250 - 1255, 2003/11

An advanced aqueous reprocessing process has been proposed for the next generation fuel cycle. Key technologies applied to the process are: removal of I-129, separation of Np and FP(Tc) separation by selective reduction of Np(VI) and high acid scrubbing of Tc within a single cycle process, MA separation by extraction chromatography and Cs/Sr separation. U separation just after dissolution was supposed to be effective to reduce the required capacity of the following extraction step. Among them Np reduction rate in TBP solution was measured, which was found to be lower than that in aqueous solution. Using an improved flow sheet spent fuel test, based on the Np reduction test, was carried out and about 90% of Np was separated before U and Pu partitioning step.

Journal Articles

A High-sensitivity and non-destructive trace element analysis based on multiple -ray detection

Oshima, Masumi; Toh, Yosuke; Hatsukawa, Yuichi; Hayakawa, Takehito; Shinohara, Nobuo

Journal of Nuclear Science and Technology, 39(4), p.292 - 294, 2002/04

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Mass-spectrometric determination of iodine-129 using O $_{2}$ -CO $_{2}$ mixed-gas reaction in inductively coupled plasma tandem quadrupole mass spectrometry

$^{129}$ I/ $^{127}$ I and $^{14}$ C records in a modern coral from Rowley Shoals off northwestern Australia reflect the 20th-century human nuclear activities and ocean/atmosphere circulations

Penetration of $^{129}$ I released from Fukushima Daiichi Nuclear Power Plant accident in the western North Pacific Ocean

Vertical distribution of $^{129}$ I released from the Fukushima Daiichi Nuclear Power Plant in the Kuroshio and Oyashio current areas

High sensitivity measurement of Iodine-129/Iodine-127 ratio by accelerator mass spectrometry

Measurement of iodine-129 by JAERI-AMS and its application to oceanography

An Advanced aqueous reprocessing process for the next generation's nuclear fuel cycle

A High-sensitivity and non-destructive trace element analysis based on multiple -ray detection

Study on gaseous effluent treatment for dissolution step of spent nuclear fuel reprocessing

Study on gaseous effluent treatment during dissolusion tests of spent fuel

Analysis of iodine 129 in gaseous radioactive waste at Tokai Reprocessing Plant

Behavior of $^{129}$ I released from the Fukushima Daiichi Nuclear Power Plant in the western North Pacific Ocean

Tracking the fate of $^{129}$ I near the seafloor off Fukushima

Development of analytical method for selenium-79 and iodine-129 in highly active liquid waste by inductively coupled plasma mass spectrometry with collision reaction cell technique

Observation of $^{129}$ I distribution in seawater at the margin of western North Pacific as a tracer of seawater from sea ice in a specific latitude zone

The Concentration and migration of iodine-129 in the ocean released from the accident of the Fukushima Daiichi Nuclear Power Plant

Subduction of iodine-129 in seawater revealed using an accelerator mass spectrometer