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Journal Articles

A Storm-induced flood and associated nearshore dispersal of the river-derived suspended $$^{137}$$Cs

Uchiyama, Yusuke*; Tokunaga, Natsuki*; Azuma, Kohei*; Kamidaira, Yuki; Tsumune, Daisuke*; Iwasaki, Toshiki*; Yamada, Masatoshi*; Tateda, Yutaka*; Ishimaru, Takashi*; Ito, Yukari*; et al.

Science of the Total Environment, 816, p.151573_1 - 151573_13, 2022/04

 Times Cited Count:4 Percentile:75.49(Environmental Sciences)

no abstracts in English

Journal Articles

First isolation and analysis of caesium-bearing microparticles from marine samples in the Pacific coastal area near Fukushima Prefecture

Miura, Hikaru*; Ishimaru, Takashi*; Ito, Yukari*; Kuribara, Yuichi; Otosaka, Shigeyoshi*; Sakaguchi, Aya*; Misumi, Kazuhiro*; Tsumune, Daisuke*; Kubo, Atsushi*; Higaki, Shogo*; et al.

Scientific Reports (Internet), 11, p.5664_1 - 5664_11, 2021/03

 Times Cited Count:8 Percentile:64.15(Multidisciplinary Sciences)

For the first time, we isolated and investigated seven CsMPs (radioactive caesium-bearing microparticles) from marine particulate matter and sediment. From the elemental composition, the $$^{134}$$Cs/$$^{137}$$Cs activity ratio, and the $$^{137}$$Cs activity per unit volume results, we inferred that the five CsMPs collected from particulate matter were emitted from Unit 2 of the FDNPP, whereas the two CsMPs collected from marine sediment were possibly emitted from Unit 3. The presence of CsMPs can cause overestimation of the solid-water distribution coefficient of Cs in marine sediments and particulate matter and a high apparent radiocaesium concentration factor for marine biota. CsMPs emitted from Unit 2, which were collected from the estuary of a river that flowed through a highly contaminated area, may have been deposited on land and then transported by the river. By contrast, CsMPs emitted from Unit 3 were possibly transported eastward by the wind and deposited directly onto the ocean surface.

Journal Articles

Development of a resonant laser ionization gas cell for high-energy, short-lived nuclei

Sonoda, Tetsu*; Wada, Michiharu*; Tomita, Hideo*; Sakamoto, Chika*; Takatsuka, Takaaki*; Furukawa, Takeshi*; Iimura, Hideki; Ito, Yuta*; Kubo, Toshiyuki*; Matsuo, Yukari*; et al.

Nuclear Instruments and Methods in Physics Research B, 295, p.1 - 10, 2013/01

 Times Cited Count:19 Percentile:83.05(Instruments & Instrumentation)

no abstracts in English

Oral presentation

Environmental monitoring from resident's point of view

Eda, Itsumu*; Omine, Mayumi*; Nemoto, Norimasa*; Shimizu, Tomoko*; Tanaka, Sachiko*; Kashima, Takao*; Ito, Yukari*; Taniyama, Hiroshi*; Kamei, Mitsuru*; Yonezawa, Rika; et al.

no journal, , 

no abstracts in English

Oral presentation

Factors affecting radiocesium concentration in sediment off Fukushima; Lateral transport of suspended particles

Otosaka, Shigeyoshi*; Suzuki, Takashi; Tsuruta, Tadahiko; Misono, Toshiharu; Mino, Yoshihisa*; Sukigara, Chiho*; Ito, Yukari*; Shirai, Kotaro*; Sugihara, Naoko*

no journal, , 

In order to clarify the transport process of suspended radiocesium from the coast to the offshore area, which is one of the processes that change the concentration of radiocesium in sediments off Fukushima, a time-series sediment trap was deployed from October 2017 to June 2018 at a station located in southeast of the Fukushima Daiichi Nuclear Power Plant. Sinking particles of 39 periods were collected by this experiment. $$^{137}$$Cs was detected from sinking particles throughout the observation period, and the concentration showed clear seasonal variation. The maximum $$^{137}$$Cs concentration was an order of magnitude higher than that in the surface sediment (0-1 cm layer) at the station. On the other hand, the observed annual sinking flux of $$^{137}$$Cs was less than 1% of the $$^{137}$$Cs inventory in the seabed column. From these results, it can be concluded that the transport of $$^{137}$$Cs-bound particles from the coastal area has a relatively small effect of changing the abundance of radiocesium in sediments.

Oral presentation

Transport of suspended radiocesium in coastal area off Fukushima

Otosaka, Shigeyoshi*; Suzuki, Takashi; Tsuruta, Tadahiko; Misono, Toshiharu; Dohi, Terumi; Mino, Yoshihisa*; Sukigara, Chiho*; Ito, Yukari*; Kanda, Jota*; Ishimaru, Takashi*

no journal, , 

A time-series sediment trap was deployed from October 2017 to June 2018 at a station located in southeast of the Fukushima Daiichi Nuclear Power Plant to clarify the transport process of suspended radiocesium from the coast to the offshore area. Sinking particles of 39 periods were collected by this experiment. Radiocesium was detected from sinking particles throughout the observation period, and the concentration showed clear seasonal variation. The observed flux of radiocesium showed maxima in winter (December-January) and spring (March-April). From detailed analysis of physical and chemical characteristics of sinking particles, it was found that sinking particles were composed of biological particles with relatively low degradation in winter and fine-grained terrestrial particles in spring. Especially in spring, high radiocesium flux was observed, and it was presumed due to lateral transport of radiocesium-bound lithogenic particles from the coastal area to the offshore. However, the effect of redistribution of radiocesium in seabed sediments by this process is considered to be limited.

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