Fluvial discharges of radiocaesium from watersheds contaminated by the Fukushima Dai-ichi Nuclear Power Plant accident, Japan

Ueda, Seinosuke; Hasegawa, H.; Kakiuchi, Hideki; Akata, Naofumi; Ohtsuka, Yoshihito; Hisamatsu, Shun’ichi

doi:10.1016/j.jenvrad.2012.11.009

Cited by 174 publications

(76 citation statements)

References 17 publications

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“…As a result of the East Japan earthquake on March 11, 2011, large amounts of radioactive substances were released into the environment by the Fukushima Daiichi nuclear power plant [1,2]. This accident has led to widespread public unease concerning radiation, and many hospitals have received numerous queries from patients with regard to medical radiation exposure.…”

Section: Introductionmentioning

confidence: 99%

Nationwide survey of radiation exposure during pediatric computed tomography examinations and proposal of age-based diagnostic reference levels for Japan

et al. 2015

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Section: Introductionmentioning

confidence: 99%

Nationwide survey of radiation exposure during pediatric computed tomography examinations and proposal of age-based diagnostic reference levels for Japan

et al. 2015

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“…These values are 1-3 times higher than the downstream Niida River in this study. Particulate forms of 137 Cs were 48 ± 10% for the upper Niida [17] and 80% for the lower Niida. These results suggest that radiocesium deposited on the surface is mainly exported as existing forms adsorbed with suspended particles, clay minerals [18], and organic matter [13] in the rivers.…”

Section: Existing Forms Of Radiocesiummentioning

confidence: 95%

“…Figure 1(b)). Ueda et al [17] reported that the 137 Cs radioactivity in river waters from the tributaries of upper Niida River was 0.25-0.49 Bq/l on November 21-22, 2011. These values are 1-3 times higher than the downstream Niida River in this study.…”

Section: Existing Forms Of Radiocesiummentioning

confidence: 99%

Dispersion of Cs-134 and Cs-137 in river waters from Fukushima and Gunma prefectures at nine months after the Fukushima Daiichi NPP accident

Nagao

Kanamori²,

Ochiai³

et al. 2014

Progress in Nuclear Science and Technology

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“…In the case of the Chernobyl nuclear power plant (ChNPP) accident, decontamination management of forests was not conducted over a wide area and little export of radioactive substances from these ecosystems has been observed (e.g., Tikhomirov et al, 1993;Ueda et al, 2013). Therefore, a large proportion of the radionuclides derived from fallout tend to remain in these ecosystems for extended periods of time; for example, 137 Cs has a slow rate of decay (the half-life of 137 Cs is 30.2 years).…”

Section: Introductionmentioning

confidence: 99%

Modeling radionuclide Cs and C dynamics in an artificial forest ecosystem in Japan -FoRothCs ver1.0-

Nishina

Hayashi

2015

Front. Environ. Sci.

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Predicting the environmental fate of Cs radionuclides in forest ecosystems is important for the effective management and assessment of radioactively contaminated forest areas. A large proportion of the radioactively contaminated areas in Japan consist of forest ecosystems, and most of these areas are artificial forests that are used for timber production [e.g., Japanese cedar (Cryptomeria japonica) and red pine (Pinus densiflora)]. Determining the long-term redistribution of 137 Cs in forest ecosystems is important for estimating human doses and understanding the ecological impacts and challenges associated with managing contaminated forests. To facilitate the management and 137 Cs decontamination of these forests, we developed a new open-source 137 Cs cycling model, ForRothCs, that considers C cycling within forests, as well as biomass production and soil decomposition processes. For the 137 Cs inventory, this model estimates the dynamics (Bq m −2 ) and activity (Bq kg −2 ) of 137 Cs on a decadal time scale, primarily in the leaves, branches, stems, litter layer, and the soil. This model is based on the biomass production and the dynamics of the C cycle models. We tested the model by considering a simple scenario of forest management, i.e., thinning and harvesting, for the first five years following a fallout event. The results showed that these activities have a limited impact on the 137 Cs inventory due to the rapid migration of 137 Cs from vegetation to soil. Our projections also showed the examined forest management practices resulted in reduced litterfall, which in turn reduced C input to the forest floor and increased the concentration of 137 Cs in the litterfall and soil organic layer. Although further validation of the ForRothCs model is required using field observation data, the model can be used to evaluate long-term 137 Cs dynamics associated with commonly used forest and decontamination management scenarios.

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Fluvial discharges of radiocaesium from watersheds contaminated by the Fukushima Dai-ichi Nuclear Power Plant accident, Japan

Cited by 174 publications

References 17 publications

Nationwide survey of radiation exposure during pediatric computed tomography examinations and proposal of age-based diagnostic reference levels for Japan

Nationwide survey of radiation exposure during pediatric computed tomography examinations and proposal of age-based diagnostic reference levels for Japan

Dispersion of Cs-134 and Cs-137 in river waters from Fukushima and Gunma prefectures at nine months after the Fukushima Daiichi NPP accident

Modeling radionuclide Cs and C dynamics in an artificial forest ecosystem in Japan -FoRothCs ver1.0-

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