Výsledky vyhledávání - "Hisaki, Kofuji"

Vertical profiles of Fukushima Dai-ichi NPP-derived radiocesium concentrations in the waters of the southwestern Okhotsk Sea (2011–2017)

Autor: Seiya Nagao, Mutsuo Inoue, Yutaka Isoda, Ken Fujimoto, Toshiki Morokado, Shizuho Miki, Hisaki Kofuji

Publikováno v: Journal of Environmental Radioactivity. 192:580-586

We examined the vertical 134Cs and 137Cs concentration profiles in the southwestern Okhotsk Sea in 2011, 2013, and 2017. In June 2011, atmospheric deposition-derived 134Cs from the Fukushima Dai-ichi Nuclear Power Plant (FDNPP) was detected at depths

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::79657e28fc9bddd520e97645474d0c9a
https://doi.org/10.1016/j.jenvrad.2018.04.021

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Temporal and spatial variations of 134Cs and 137Cs levels in the Sea of Japan and Pacific coastal region: Implications for dispersion of FDNPP-derived radiocesium

Autor: Y. Yagi, Naoto Honda, H. Takata, Daisuke Ambe, Y. Shirotani, Hisaki Kofuji, Mutsuo Inoue, Shiori Yamashita, Seiya Nagao

Publikováno v: Journal of Environmental Radioactivity. 182:142-150

To investigate the dispersion of Fukushima Dai-ichi Nuclear Power Plant (FDNPP)-derived radiocesium in the Sea of Japan and western Pacific coastal region and determine the sources of radiocesium in these areas, we examined the temporal and spatial v

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::81079eb60ff9d2dc2ff9328a13047390
https://doi.org/10.1016/j.jenvrad.2017.11.032

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Spatial variation in low-level 134Cs in the coastal sediments off central Honshu in the Sea of Japan: implications for delivery, migration, and redistribution patterns

Autor: Seiya Nagao, Mutsuo Inoue, H. Uemura, N. Kudo, Y. Shirotani, Ken Fujimoto, H. Takata, Hisaki Kofuji

Publikováno v: Journal of Oceanography. 73:571-584

In 2014 and 2015, we examined the spatial distribution of cesium-134 (half-life: 2.06 years) from the Fukushima Dai-ichi Nuclear Power Plant (FDNPP) in marine sediments within coastal–basin areas (water depths of 40–520 m) off central Honshu Isla

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::b98aca1e5280ab15ed6594c500b8bcb3
https://doi.org/10.1007/s10872-017-0437-x

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Migration area of the Tsushima Warm Current Branches within the Sea of Japan: Implications from transport of 228Ra

Autor: Hisaki Kofuji, Y. Shirotani, Yasunori Hamajima, K. Yoshida, Naoto Honda, Akihiro Shiomoto, Masayoshi Yamamoto, Yutaka Isoda, Seiya Nagao, Akihiko Morimoto, Tetsutaro Takikawa, Ken Fujimoto, Y. Furusawa, M. Minakawa, Mutsuo Inoue

Publikováno v: Continental Shelf Research. 143:167-174

We investigated lateral profiles of 228Ra (half-life; 5.75 years) activity and 228Ra/226Ra (1600 years) activity ratio using 241 surface water samples collected in/around the Sea of Japan and the East China Sea (ECS) during June–October of 2009–2

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::f9ca87a5918ffeefd0f1146c93f99615
https://doi.org/10.1016/j.csr.2016.08.010

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Simple 40K removal by acidified water leaching for estimating low levels of radiocesium in fishery products following Fukushima Dai-ichi Nuclear Power Plant accident

Autor: Shizuho Miki, Hisaki Kofuji, Mutsuo Inoue, Shiori Yamashita, K. Fujimoto, Seiya Nagao

Publikováno v: Applied Radiation and Isotopes. 120:17-21

We developed a simple method for 40K removal by acidified water leaching combined with ammonium phosphomolybdate coprecipitation, for estimating low levels of radiocesium in Japanese flounder. 40K removal from ashed samples was approximately 98%, wit

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::f13896a42a1b633ea705353615a8ed08
https://doi.org/10.1016/j.apradiso.2016.11.008

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Kuroshio fractions in the southwestern sea of Japan; implications from radium isotopes

Autor: Y. Shirotani, Hisaki Kofuji, Hiroaki Kameyama, Masashi Ito, Toshiki Morokado, Masa-aki Yoshida, Mutsuo Inoue, Shotaro Hanaki, Seiya Nagao, Takafumi Shikata, Akira Okino

Publikováno v: Continental Shelf Research. 214:104328

To understand complicated current systems, we examined the 228Ra activities and 228Ra/226Ra activity ratios in 290 surface waters in the southwestern Sea of Japan from 2015 to 2020. The 228Ra/226Ra ratios exhibited large seasonal variation, showing h

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::de41f3581c28f94d5742aec2626b75d4
https://doi.org/10.1016/j.csr.2020.104328

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Migration of the FDNPP-derived 134Cs and 137Cs along with 226Ra and 228Ra concentrations across the northwestern North Pacific Ocean

Autor: Y. Shirotani, Hisaki Kofuji, Mutsuo Inoue, Seiya Nagao, Jun Nishioka, Yuri N. Volkov

Publikováno v: Journal of Environmental Radioactivity. :33-38

We examined lateral distributions of 134Cs, 137Cs, 226Ra, and 228Ra in the surface seawaters around the Kuril Islands and the Kamchatka Peninsula in the northwestern North Pacific Ocean during June 2014. The sampling area included three water current

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::024b068951310fdaa1a31cc080e7921e
https://doi.org/10.1016/j.jenvrad.2016.05.011

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