Characterization of Radiocesium in Soil Sampled at the Koshinetsu and Kanto Regions

Ochi, Kotaro; Fujii, Kengo; Hagiwara, Kenta; Ohbuchi, Atsushi; Koike, Yuya

doi:10.2116/bunsekikagaku.66.175

Cited by 4 publications

(5 citation statements)

References 5 publications

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“…Radioactive caesium in the soil tended to increase with the number of days (since the nuclear accident) in the insoluble RES fraction. 11) We guess that the radioactive caesium in the RES fraction of sediment sample is chemically stable with lapse of time.…”

Section: Resultsmentioning

confidence: 99%

“…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%

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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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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fixed Point Observations and Characterization of Radioactive Caesium in Tama River

2021

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“…In situ measurement was performed on a grid pattern over the entire area of the pond. From Figure 10, the impacts of the FDNPS accident were observed in the two ponds because Ochi et al 9 reported that the activity concentration of 137 Cs in the soil before the FDNPS accident in Kanto region was approximately 12.0 Bq kg −1 . Ochiai et al 20 reported temporal changes in sedimentation flux of radiocesium after the accident by investigating the contribution of the impact of the FDNPS accident in Western Japan.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…In situ measurement was performed on a grid pattern over the entire area of the pond. From Figure , the impacts of the FDNPS accident were observed in the two ponds because Ochi et al . reported that the activity concentration of 137 Cs in the soil before the FDNPS accident in Kanto region was approximately 12.0 Bq kg –1 .…”

Section: Results and Discussionmentioning

confidence: 99%

“…The behavior of radiocesium in reservoirs was investigated in the coastal region (Hama-dori), which is in the eastern part of Fukushima prefecture. It is estimated that radiocesium is stable because it binds to the inner sphere of clay minerals in soil. − Yoshimura et al investigated soil erosion for various cases of land use to estimate the migration of radiocesium into rivers. Fan et al indicated that river sediment has high fixation ability to 137 Cs.…”

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Development of an Analytical Method for Estimating Three-Dimensional Distribution of Sediment-Associated Radiocesium at a Reservoir Bottom

et al. 2018

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After the Fukushima Daiichi Nuclear Power Station accident, the distributions of sediment-associated radiocesium were investigated to evaluate the dispersion and accumulation of radiocesium in the reservoir field. To develop an analytical method for measuring the horizontal and vertical distributions of radiocesium on a wide scale, we obtained 253 gamma-ray spectra at the bottoms of 64 ponds in Fukushima during 2014-2016 by using a NaI(Tl) scintillation detector. For visualizing horizontal distribution, the correlation between detector counting rate and radiocesium concentration of the bottom sediment was confirmed. In estimating vertical distribution, the depth profile of sediment-associated radiocesium was found to be correlated to the intensities of scattered and photo peaks. Good agreement was observed between the results of in situ spectrometry and core sampling. These results indicate that the developed method is suitable for understanding the behavior of radiocesium and determining whether decontamination of reservoirs is required.

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Characterization of soluble and insoluble radioactive cesium in municipal solid waste incineration fly ash

Ohbuchi¹,

Fujii

Kasari

et al. 2020

Chemosphere

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Characterization of Radiocesium in Soil Sampled at the Koshinetsu and Kanto Regions

Cited by 4 publications

References 5 publications

Fixed Point Observations and Characterization of Radioactive Caesium in Tama River

Fixed Point Observations and Characterization of Radioactive Caesium in Tama River

Development of an Analytical Method for Estimating Three-Dimensional Distribution of Sediment-Associated Radiocesium at a Reservoir Bottom

Characterization of soluble and insoluble radioactive cesium in municipal solid waste incineration fly ash

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