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Journal Articles

Simulation study on $$^{3}$$H behavior in the Fukushima coastal region; Comparison of influences of discharges from the Fukushima Daiichi and rivers

Sakuma, Kazuyuki; Yamada, Susumu; Machida, Masahiko; Kurikami, Hiroshi; Misono, Toshiharu; Nakanishi, Takahiro; Iijima, Kazuki

Marine Pollution Bulletin, 192, p.115054_1 - 115054_10, 2023/07

https://doi.org/10.1016/j.marpolbul.2023.115054
 Times Cited Count：2 Percentile：31.80(Environmental Sciences)

Journal Articles

Migration processes of radioactive cesium in the Fukushima nearshore area; Impacts of riverine input and resuspension

Misono, Toshiharu; Nakanishi, Takahiro; Tsuruta, Tadahiko; Shiribiki, Takehiko; Sanada, Yukihisa

Marine Pollution Bulletin, 178, p.113597_1 - 113597_9, 2022/05

https://doi.org/10.1016/j.marpolbul.2022.113597
 Times Cited Count：5 Percentile：62.61(Environmental Sciences)

It is essential to evaluate secondary migration caused by riverine input and resuspension from seabed sediments to estimate the future distribution of radioactive cesium ($$^{137}$$Cs) in the coastal area off Fukushima Prefecture. In particular, the inflow from rivers cannot be ignored because most of the $$^{137}$$Cs inflow from rivers is deposited on the coast without elute into seawater. Two mooring systems were installed near the Ukedo River's mouth (Fukushima Prefecture) from February 2017 to February 2018. The first contained a sediment trap system, collecting sinking particles during the period. The second comprised a turbidity sensor and a current sensor. The contribution of resuspension and inflow from the river to the mass flux was quantitatively evaluated using multiple regression equations. The results showed that resuspension caused 79%-83% of secondary $$^{137}$$Cs migration in nearshore areas, whereas the influence of riverine $$^{137}$$Cs input on the sediment was only 7% per year.

Journal Articles

Detection and temporal variation of $$^{60}$$Co in the digestive glands of the common octopus, ${it Octopus vulgaris}$, in the East China Sea

Morita, Takami*; Otosaka, Shigeyoshi; Fujimoto, Ken*; Nishiuchi, Ko*; Kimoto, Katsunori*; Yamada, Haruya*; Kasai, Hiromi*; Minakawa, Masayuki*; Yoshida, Katsuhiko*

Marine Pollution Bulletin, 60(8), p.1193 - 1199, 2010/08

https://doi.org/10.1016/j.marpolbul.2010.03.031
 Times Cited Count：3 Percentile：10.00(Environmental Sciences)

Significant concentrations of $$^{60}$$Co, $$^{137}$$Cs and $$^{108m}$$Ag were detected in common octopus specimens collected in the East China Sea during two periods, 1986-1989 and 1996-2005. The radionuclides detected in the former period were thought to originate from the global fallout. On the other hand, the source of $$^{60}$$Co in the latter period has remained unclear because the $$^{60}$$Co concentration decreased continuously with shorter half-lives than the physical half-lives. This tendency suggests that the source of $$^{60}$$Co in 1996-2005 was identical and was temporary supplied to the East China Sea. Investigations of common octopus in the other area indicated that the origin of the pollutant source of $$^{60}$$Co in 1996-2005 occurred locally in the restricted area in the East China Sea rather than in the coastal area of Japan.

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