Radiocesium dynamics in the aquatic ecosystem of Lake Onuma on Mt. Akagi following the Fukushima Dai-ichi Nuclear Power Plant accident

Suzuki, Kyuma; Watanabe, Shun; Yuasa, Yumi; Yamashita, Yasunori; Arai, Hajime; Tanaka, Hideki; Kuge, Toshihiro; Mori, Miwako; Tsunoda, Kin-ichi; Nohara, Seiichi; Iwasaki, Yoshiaki; Minai, Yoshitaka; Okada, Yukiko; Nagao, Seiya

doi:10.1016/j.scitotenv.2017.12.017

Cited by 32 publications

(21 citation statements)

References 55 publications

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“…Some studies have focused on radionuclide contaminations in surface waters, both on land, e.g., (Konoplev, 2016;Konoplev et al, 2018;Naulier et al, 2017;Suzuki et al, 2018;Wakiyama et al, 2017) and in the Pacific Ocean, e.g., (Casacuberta et al, 2013;Castrillejo et al, 2016;Sanial et al, 2017;Takata et al, 2019;Vives i Batlle et al, 2018). In this study, we add a data set of radionuclides in (primarily fresh) water samples soon after the accident in the vicinity of FDNPP.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Radionuclides in surface waters around the damaged Fukushima Daiichi NPP one month after the accident: Evidence of significant tritium release into the environment

Querfeld

Pasi

Shozugawa

et al. 2019

Science of The Total Environment

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Following the Fukushima nuclear accident (2011), radionuclides mostly of volatile elements (e.g., 131 I, 134,137 Cs, 132 Te) have been investigated frequently for their presence in the atmosphere, pedosphere, biosphere, and the Pacific Ocean. Smaller releases of radionuclides with intermediate volatility, (e.g., 90 Sr), have been reported for soil. However, few reports have been published which targeted the contamination of surface (fresh) waters in Japan soon after the accident. In the present study, 10 surface water samples (collected on April 10, 2011) have been screened for their radionuclide content ( 3 H, 90 Sr, 129 I, 134 Cs, and 137 Cs), revealing partly unusually high contamination levels. Especially high tritium levels (184 ± 2 Bq•L -1 ; the highest levels ever reported in scientific literature after Fukushima) were found in a puddle water sample from close to the Fukushima Daiichi nuclear power plant. The ratios between paddy/puddle water from one location only a few meters apart vary around 1% for 134 Cs, 12% for 129 I ( 131 I), and around 40% for both 3 H and 90 Sr. This illustrates the adsorption of radiocesium on natural minerals and radioiodine on organic substances (in the rice paddy), whereas the concentration differences of 3 H and 90 Sr between the two waters are mainly dilution driven.

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Section: Accepted Manuscriptmentioning

confidence: 99%

Radionuclides in surface waters around the damaged Fukushima Daiichi NPP one month after the accident: Evidence of significant tritium release into the environment

Querfeld

Pasi

Shozugawa

et al. 2019

Science of The Total Environment

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“…At present, the activity concentration of Cs in river water is quite low 7 – 9 . However, in closed lakes, there is a problem of long-tailed temporal change in low-level radioactive contamination because the activity concentration declines steeply immediately after the accident, but then turns to a gradual decrease 6 , 10 . Such a problem is also observed in closed lakes and small lakes after the Chernobyl accident 11 , 12 .…”

Section: Introductionmentioning

confidence: 99%

“…Lake Onuma on Mt. Akagi in Gunma Prefecture located about 190 km from the FDNPP is a semi-closed system with limited amount of inflow and runoff water and an average water residence time of 2.3 years 10 . In August 2011, Cs plus Cs activity concentration of pond smelt (Hypomesus nipponensis), a typical fish species inhabiting in Lake Onuma exceeded 500 Bq the standard limits of radiocesium of foods in Japan at that time.…”

Section: Introductionmentioning

confidence: 99%

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Long-term prediction of $$^{137}$$Cs in Lake Onuma on Mt. Akagi after the Fukushima accident using fractional diffusion model

Suetomi

Hatano

Fujita

et al. 2021

Sci Rep

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The Fukushima Daiichi Nuclear Power Plant accident also contaminates lakes in Japan. Especially in closed lakes, there is a problem of prolonged low-level $$^{137}$$ 137 Cs contamination because the activity concentration of $$^{137}$$ 137 Cs declines sharply immediately after the accident, but then begins to decrease slowly. In this paper, we derived a long-term prediction formula based on the fractional diffusion model (FDM) for the temporal variation in $$^{137}$$ 137 Cs activity concentrations of the water in Lake Onuma on Mt. Akagi, one of the closed lakes, and of pond smelt (Hypomesus nipponensis), a typical fish species inhabiting in the lake. The formula reproduced well the measured $$^{137}$$ 137 Cs activity concentration of the lake water and pond smelt for 5.4 years after the accident. Next, we performed long-term prediction for 10,000 days using this formula and compared it with the prediction results of the two-component decay function model (TDM), which is the most common model. The results suggest that the FDM prediction will lead to a longer period of contamination with low-level $$^{137}$$ 137 Cs than the TDM prediction.

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“…In plants, the frequency of morphological abnormalities was increased in fir trees [ 10 ]. However, these studies have focused on terrestrial wildlife, and few studies on radiation effects have been conducted in fish, although transfer of radionuclides to fish has been well studied in lakes, rivers and seas [ 11 , 12 ].…”

Section: Introductionmentioning

confidence: 99%

Radiation effects on wild medaka around Fukushima Dai-ichi Nuclear Power Plant assessed by micronucleus assay

Maruyama

Wang

Doi

et al. 2020

Journal of Radiation Research

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Since the Fukushima Dai-ichi Nuclear Power Plant (F1-NPP) accident in 2011, radiation effects on wildlife in the contaminated areas have been a major concern. The outskirts of the F1-NPP are mainly rural areas, where many rice fields, streams and reservoirs are located. We searched for wild medaka (small aquarium fish) around the F1-NPP and found two wild medaka habitats (S1 and S2). S1 is a stream located 4 km from the F1-NPP, where the ambient dose equivalent rate was 0.4–0.9 μSv/h (2013–14), and S2 is a reservoir located 7.5 km from the F1-NPP, where the ambient dose equivalent rate was 9.8–22 μSv/h (2013–14 and 2017–18). Dosimeters were placed for one day at the locations where the medaka were captured, and the absorbed dose rates were estimated. Radiation effects on wild medaka were examined using micronucleus assay between 2013 and 2018. No significant difference in frequency of micronucleated gill cells was observed among the wild medaka from S1, S2 and our cultivated medaka that were used as a control.

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Radiocesium dynamics in the aquatic ecosystem of Lake Onuma on Mt. Akagi following the Fukushima Dai-ichi Nuclear Power Plant accident

Cited by 32 publications

References 55 publications

Radionuclides in surface waters around the damaged Fukushima Daiichi NPP one month after the accident: Evidence of significant tritium release into the environment

Radionuclides in surface waters around the damaged Fukushima Daiichi NPP one month after the accident: Evidence of significant tritium release into the environment

Long-term prediction of $$^{137}$$Cs in Lake Onuma on Mt. Akagi after the Fukushima accident using fractional diffusion model

Radiation effects on wild medaka around Fukushima Dai-ichi Nuclear Power Plant assessed by micronucleus assay

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