Temporal changes of radiocesium in irrigated paddy fields and its accumulation in rice plants in Fukushima

Yang, Bing; Onda, Yuichi; Wakiyama, Yoshifumi; Yoshimura, Kazuya; Sekimoto, Hitoshi; Ha, Yiming

doi:10.1016/j.envpol.2015.10.030

Cited by 21 publications

(9 citation statements)

References 36 publications

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“…However, the two CC+LR plots with matting had mean decreases of the total discharge rates of soil and leaf of 52%; and of 137 Cs inventories of 58% related to the control plots. These results were in agreement with those observed by Yang et al (2016) in rice paddies in Fukushima Prefecture, where surface-soil-removal caused the exponentially decreased of radiocesium ( 134 Cs and 137 Cs) activity in suspended sediment in irrigation water. Iijima et al (2013) evaluated the effectiveness of decontaminating (by cutting down) a highly polluted evergreen forest located 1.3 km southwest of the FDNPP, concluding that radiocesium was mostly adsorbed on the surface of trees and partly penetrated into the trunks through the bark; stripping contaminated topsoil and pruning the trees also reduced the air dose rates although in a minor way.…”

Section: Discussionsupporting

confidence: 92%

“…After the accident, a variety of decontamination practices (soil removal in paddies, forests and schoolyards, litter removal, etc.) has been done, reducing the ambient dose rates (Hashimoto et al, 2012;Saegusa et al, 2015;Yang et al, 2016). This accident caused important economic damages that include, among others, the cost of decontamination practices, and the abandonment of cultivated and residential areas (Yasutaka and Naito, 2016).…”

Section: Introductionmentioning

confidence: 99%

“…In cultivated soils near Kawamata Town (Fuk-Pref), the radiocesium accumulation in rice plant decreased with time (2012-2014) in both control and decontaminated fields (Yang et al, 2016).…”

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confidence: 99%

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Radiocesium concentrations in soil and leaf after decontamination practices in a forest plantation highly polluted by the Fukushima accident

López‐Vicente

Onda

Takahashi

et al. 2018

Environmental Pollution

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Owing to the Fukushima Dai-ichi Nuclear Power Plant (FDNPP) accident a vast amount of radiocesium was released polluting the land. Afterwards, a variety of decontamination practices has been done, reducing the ambient dose rates. In this study we evaluated the effectiveness of eight forest decontamination practices by means of monitoring the radiocesium (Cs) concentration in soil and leaf samples, and the daily discharge rates in ten plots during 27 months (May 2013-July 2015). A forest plantation located 16 km southwest to the FDNPP and within the exclusion area was selected. Radiocesium concentrations were analysed using a germanium gamma ray detector. The differences in radiocesium activities between the different plots were statistically significant (p < 0.05) and four homogeneous groups were distinguished. Tree thinning and litter removal greatly reduced the radioactivity and the two plots devoted to these practices presented the highest discharge rates of Cs (Th + LR; 350-380 Bq/m day), followed by the two Th plots (163-174 Bq/m day). The clearcutting with LR and the LR plots (104 and 92 Bq/m day) also had higher rates than those rates in the control plots (51 Bq/m day). We only observed low rates in the two plots with matting (19-25 Bq/m day). The temporal variability was explained by (i) the different rainfall depths registered during the measurement intervals (accumulated precipitation from 14 to 361 mm); and (ii) the fluctuations of the total surface coverage. The decrease trend in radiocesium concentration was high in 2013, moderate in 2014 and low in 2015 owing to the vegetation recovery after the countermeasures, thus reducing the possibility of the second pollution of the neighbouring areas. The average proportions of contribution of Cs discharge by soil and leaf fraction were 96.6% and 3.4%.

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Section: Discussionsupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

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Radiocesium concentrations in soil and leaf after decontamination practices in a forest plantation highly polluted by the Fukushima accident

López‐Vicente

Onda

Takahashi

et al. 2018

Environmental Pollution

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“…5 ). This behaviour is likely explained by the high sediment connectivity of paddy fields, which were shown to be the main sources of contamination to the rivers shortly after the accident 23 . Transfers of radiocesium-bound sediment from paddy fields are exacerbated during different periods of the year, depending on the rice cultivation cycle.…”

Section: Discussionmentioning

confidence: 99%

Quantifying the dilution of the radiocesium contamination in Fukushima coastal river sediment (2011–2015)

Evrard

Laceby

Onda

et al. 2016

Sci Rep

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Fallout from the Fukushima Dai-ichi nuclear power plant accident resulted in a 3000-km2 radioactive contamination plume. Here, we model the progressive dilution of the radiocesium contamination in 327 sediment samples from two neighboring catchments with different timing of soil decontamination. Overall, we demonstrate that there has been a ~90% decrease of the contribution of upstream contaminated soils to sediment transiting the coastal plains between 2012 (median – M – contribution of 73%, mean absolute deviation – MAD – of 27%) and 2015 (M 9%, MAD 6%). The occurrence of typhoons and the progress of decontamination in different tributaries of the Niida River resulted in temporary increases in local contamination. However, the much lower contribution of upstream contaminated soils to coastal plain sediment in November 2015 demonstrates that the source of the easily erodible, contaminated material has potentially been removed by decontamination, diluted by subsoils, or eroded and transported to the Pacific Ocean.

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“…Moreover, after the Fukushima accident in 2011, studies on the decontamination of agricultural land and the safety of agricultural products have been carried out extensively in Japan [6][7][8][9]. In particular, various decontamination countermeasures such as topsoil removal and potassium fertilizer application have been focused upon as steps to reduce the activity concentration of rice, which a staple crop in Japan [10][11][12]. The management of the agricultural food product system is very important for reducing radiation exposure by ingestion of contaminated food after a nuclear accident.…”

Section: Introductionmentioning

confidence: 99%

Effect of Agricultural Countermeasures on Ingestion Dose Following a Nuclear Accident

et al. 2019

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Background: Management of an agricultural food product system following a nuclear accident is indispensable for reducing radiation exposure due to ingestion of contaminated food. The present study analyzes the effect of agricultural countermeasures on ingestion dose following a nuclear accident. Materials and Methods: Agricultural countermeasures suitable for domestic farming environments were selected by referring to the countermeasures applied after the Fukushima accident in Japan. The avertable ingestion doses that could be obtained by implementing the selected countermeasures were calculated using the Korean Agricultural Countermeasure Analysis Program (K-ACAP) to investigate the efficiency of each countermeasure. Results and Discussion: Of the selected countermeasures, the management of crops was effective when radionuclide deposition occurred during the growing season of plants. Treatment by soil additive and topsoil removal was effective when deposition occurred during the nongrowing season of plants. The disposal of milk was not effective owing to the small contribution of milk to the overall ingestion dose. Clean feeding of livestock was effective when deposition occurred during the growing season of fodder plants such as pasture and rice-straw. Finally, the effect of food restriction increased with the soil deposition density of radionuclide. The practical effect of countermeasures was very small when the avertable ingestion dose was absolutely low. Conclusion: The agricultural countermeasures selected to reduce the radionuclide ingestion dose after a nuclear accident must be made appropriate by considering the accident situation, such as the soil deposition density of the radionuclide and the deposition date in relation to farming cycles.

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Temporal changes of radiocesium in irrigated paddy fields and its accumulation in rice plants in Fukushima

Cited by 21 publications

References 36 publications

Radiocesium concentrations in soil and leaf after decontamination practices in a forest plantation highly polluted by the Fukushima accident

Radiocesium concentrations in soil and leaf after decontamination practices in a forest plantation highly polluted by the Fukushima accident

Quantifying the dilution of the radiocesium contamination in Fukushima coastal river sediment (2011–2015)

Effect of Agricultural Countermeasures on Ingestion Dose Following a Nuclear Accident

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