Delivery mechanism of 134Cs and 137Cs in seawater off the Sanriku Coast, Japan, following the Fukushima Dai-ichi NPP accident

Inoue, Mutsuo; Kofuji, Hisaki; Fujimoto, Ken; Furusawa, Yoshie; Yoshida, Keisuke; Nagao, Seiya; Yamamoto, Masayoshi; Hamajima, Yasunori; Minakawa, Masayuki

doi:10.1016/j.jenvrad.2014.07.001

Cited by 8 publications

(4 citation statements)

References 20 publications

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“…Inoue et al . () discussed the subsurface peaks of Fukushima‐derived radioactive Cs observed based on radium isotope data in July 2012 along the northern Sanriku coast (Fig. b), further north from Sendai Bay.…”

Section: Fukushima‐derived Radioactive Cesium In Near Coastal Area Ofmentioning

confidence: 99%

“…Continuous monitoring should be conducted to clarify how these continuous sources affect the concentration level of radioactive Cs in the coastal area around the FNPP site. Inoue et al (2014) discussed the subsurface peaks of Fukushima-derived radioactive Cs observed based on radium isotope data in July 2012 along the northern Sanriku coast (Fig. 1b), further north from Sendai Bay.…”

Section: Fukushima-derived Radioactive Cesium In Near Coastal Area Ofmentioning

confidence: 99%

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Oceanic dispersion of Fukushima‐derived radioactive cesium: a review

Kaeriyama

2016

Fisheries Oceanography

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This review summarizes the more than 70 papers published during the 4 years since the Fukushima Dai-ichi nuclear power plant accident that occurred on 11 March 2011, and details the radioactive cesium dispersion pattern in the North Pacific and adjacent seas. The total amount of Fukushima-derived radioactive cesium released into the North Pacific via atmospheric deposition and direct release, spatial and temporal changes in the Pacific coast around the accident site, and the concentration levels of radioactive cesium around the Japanese Islands, not only the Pacific coast but also in adjacent seas, such as Japan Sea, East China Sea are summarized. Based on observational data mostly obtained during 2 years since the accident, and simulation results, oceanic dispersion of radioactive cesium in the entire area of the North Pacific is described. The Fukushima-derived radioactive cesium dispersed eastward as surface water and extended to the eastern side of the North Pacific in 2014, and was also observed via a southward intrusion to subsurface waters as Subtropical Mode Water and Central Mode Water. The radioactive cesium movement related to mode water is important in terms of the circulation of cesium into the ocean interior. Some new technologies and techniques concerning emergency monitoring of radioactivity in the ocean environment are also reported, the effectiveness of which has been demonstrated by use in relation to the Fukushima accident.

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Section: Fukushima‐derived Radioactive Cesium In Near Coastal Area Ofmentioning

confidence: 99%

Section: Fukushima-derived Radioactive Cesium In Near Coastal Area Ofmentioning

confidence: 99%

Oceanic dispersion of Fukushima‐derived radioactive cesium: a review

Kaeriyama

2016

Fisheries Oceanography

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“…Radioactive caesium ( 134 Cs and 137 Cs) was released into the environment contaminated rivers, [1][2][3][4] forests, 5-7) soils, [8][9][10][11] and oceans [12][13][14] by Fukushima Dai-ichi Nuclear Power Plant Accident in 2011. It is particularly important to analyze the radioactive caesium in rivers, as it has a major impact on humans and spreads radioactive contamination.…”

Section: Introductionmentioning

confidence: 99%

Fixed Point Observations and Characterization of Radioactive Caesium in Tama River

2021

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Behavior of radioactive caesium, derived from Fukushima Dai-ichi Nuclear Power Plant Accident, in river water and sediment investigated during 2012-2016. Concentrations of radioactive caesium in river water and sediment were decreased with time exponentially. The residence half-life of radioactive caesium in the river water and sediment were 0.788-1.50 year for 134 Cs, 1.22-2.17 year for 137 Cs. Any decrease in radioactive caesium concentration in the Tama river is because of weathering effect than radioactive decay. Concentrations of suspended radioactive caesium temporarily increased when sediments were resuspended due to rain.On the other hand, dissolved radioactive caesium is not easily impacted by this factor. Radioactive caesium concentration in sediments was considerably higher than that in river water. It indicated that much of the radioactive caesium in the Tama river existed in the sediments. Sequential extraction, elemental and crystal phase analysis were performed on the sediments and examined the chemical state of radioactive caesium as well as the adsorption mechanism. Radioactive caesium in sediment was present in a stable chemical form, and there is possibility that radioactive caesium was incorporated in biotite.

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“…The radioactive fallout from the Fukushima Daiichi nuclear disaster caused by the Great East Japan Earthquake was scattered onto fields over a wide region of northern Japan. Several studies have reported inventory analyses of the released radionuclides (Ochiai et al, 2013;Thakur et al, 2013;Thornton et al, 2013;Inoue et al, 2014;Yamaguchi et al, 2014;Tanaka et al, 2015;Kinouchi et al, 2015;Yu et al, 2015;Men et al, 2015). Radioactive decontamination work is now underway in Fukushima and interim storage facilities to store the contaminated soil, leaves, and debris are currently being planned.…”

Section: Introductionmentioning

confidence: 99%

Demonstration testing of a system for the high-speed monitoring of the radioactive concentration of wastewater in situ

Fukui¹,

Oota²,

Hirano³

et al. 2017

Desalination and Water Treatment

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a b s t r ac tWhile the NaI(Tl) scintillation detector lacks a high energy resolution, it has the merit of high sensitivity. The NaI(Tl) scintillation detector is considered suitable for the high-speed measurement of cesium-134 and cesium-137 together. We developed "Cesimoni-water" as a system for the in situ monitoring of the radioactive concentration of wastewater by combining an NaI(Tl) scintillation detector with a water shield technique for shielding out external natural background radiation. In this paper, we describe the Cesimoni-water system and demonstration tests carried out with the system using simulated wastewater.

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Delivery mechanism of 134Cs and 137Cs in seawater off the Sanriku Coast, Japan, following the Fukushima Dai-ichi NPP accident

Cited by 8 publications

References 20 publications

Oceanic dispersion of Fukushima‐derived radioactive cesium: a review

Oceanic dispersion of Fukushima‐derived radioactive cesium: a review

Fixed Point Observations and Characterization of Radioactive Caesium in Tama River

Demonstration testing of a system for the high-speed monitoring of the radioactive concentration of wastewater in situ

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