Visualization of radiocesium distribution in surface layer of seafloor around Fukushima Daiichi Nuclear Power Plant

Abstract Large quantities of volatile radionuclides were released into the atmosphere and the hydrosphere following the Fukushima Daiichi Nuclear Power Plant (FDNPP) accident on March, 2011. Monitoring of radiocesium in sediment is important for evaluating the behavior of radiocesium in the environm...

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Autores principales:	Yukihisa Sanada, Yoshimi Urabe, Toshiharu Misonou, Takehiko Shiribiki, Takahiro Nakanishi, Yusuke Watanabe, Tadahiko Tsuruta
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/52532e0205124e8b94e4f5997a0b1a37
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spelling	oai:doaj.org-article:52532e0205124e8b94e4f5997a0b1a372021-12-05T12:13:59ZVisualization of radiocesium distribution in surface layer of seafloor around Fukushima Daiichi Nuclear Power Plant10.1038/s41598-021-02646-92045-2322https://doaj.org/article/52532e0205124e8b94e4f5997a0b1a372021-11-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-02646-9https://doaj.org/toc/2045-2322Abstract Large quantities of volatile radionuclides were released into the atmosphere and the hydrosphere following the Fukushima Daiichi Nuclear Power Plant (FDNPP) accident on March, 2011. Monitoring of radiocesium in sediment is important for evaluating the behavior of radiocesium in the environment and its effect on aquatic organisms. In this study, the radiocesium distribution in the surface sediment around the FDNPP was visualized as a radiocesium concentration map using periodical survey data from a towed gamma-ray detection system. The uncertainty of the radiocesium map was evaluated via comparison with a large amount of sediment core sample data. The characteristics of the radiocesium distribution were examined considering the seafloor topography and a geological map, which were obtained via acoustic wave survey. The characteristics of the formation of 137Cs anomaly at the estuaries were analyzed using a contour map of 137Cs concentration combined with water depth. Validation of the created map showed that it was comparable with actual sediment core samples. The map generated using the towed radiation survey depicted the 137Cs concentration distribution as the position resolution of a 1 km mesh. Finally, the 137Cs concentration decreased with time in consideration of such uncertainty.Yukihisa SanadaYoshimi UrabeToshiharu MisonouTakehiko ShiribikiTakahiro NakanishiYusuke WatanabeTadahiko TsurutaNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-13 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Yukihisa Sanada Yoshimi Urabe Toshiharu Misonou Takehiko Shiribiki Takahiro Nakanishi Yusuke Watanabe Tadahiko Tsuruta Visualization of radiocesium distribution in surface layer of seafloor around Fukushima Daiichi Nuclear Power Plant
description	Abstract Large quantities of volatile radionuclides were released into the atmosphere and the hydrosphere following the Fukushima Daiichi Nuclear Power Plant (FDNPP) accident on March, 2011. Monitoring of radiocesium in sediment is important for evaluating the behavior of radiocesium in the environment and its effect on aquatic organisms. In this study, the radiocesium distribution in the surface sediment around the FDNPP was visualized as a radiocesium concentration map using periodical survey data from a towed gamma-ray detection system. The uncertainty of the radiocesium map was evaluated via comparison with a large amount of sediment core sample data. The characteristics of the radiocesium distribution were examined considering the seafloor topography and a geological map, which were obtained via acoustic wave survey. The characteristics of the formation of 137Cs anomaly at the estuaries were analyzed using a contour map of 137Cs concentration combined with water depth. Validation of the created map showed that it was comparable with actual sediment core samples. The map generated using the towed radiation survey depicted the 137Cs concentration distribution as the position resolution of a 1 km mesh. Finally, the 137Cs concentration decreased with time in consideration of such uncertainty.
format	article
author	Yukihisa Sanada Yoshimi Urabe Toshiharu Misonou Takehiko Shiribiki Takahiro Nakanishi Yusuke Watanabe Tadahiko Tsuruta
author_facet	Yukihisa Sanada Yoshimi Urabe Toshiharu Misonou Takehiko Shiribiki Takahiro Nakanishi Yusuke Watanabe Tadahiko Tsuruta
author_sort	Yukihisa Sanada
title	Visualization of radiocesium distribution in surface layer of seafloor around Fukushima Daiichi Nuclear Power Plant
title_short	Visualization of radiocesium distribution in surface layer of seafloor around Fukushima Daiichi Nuclear Power Plant
title_full	Visualization of radiocesium distribution in surface layer of seafloor around Fukushima Daiichi Nuclear Power Plant
title_fullStr	Visualization of radiocesium distribution in surface layer of seafloor around Fukushima Daiichi Nuclear Power Plant
title_full_unstemmed	Visualization of radiocesium distribution in surface layer of seafloor around Fukushima Daiichi Nuclear Power Plant
title_sort	visualization of radiocesium distribution in surface layer of seafloor around fukushima daiichi nuclear power plant
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/52532e0205124e8b94e4f5997a0b1a37
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Visualization of radiocesium distribution in surface layer of seafloor around Fukushima Daiichi Nuclear Power Plant

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