Changes in air dose rates due to soil moisture content in the Fukushima prefecture forests

Nakanishi, Miyu; Onda, Yuichi; Takahashi, Jun; Kato, Hiroaki; Iida, Hiroki; Takada, Momo

doi:10.1016/j.envpol.2023.122147

Cited by 2 publications

(1 citation statement)

References 24 publications

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“…The DGT devices were deployed at the Ukedo River (UKER) and its branch Takase River (TAKR) in September 2021 and at the Kuma River (KUMR) and the Ota River (OHTR) in addition to UKER and TAKR in June 2022. In September 2022, the devices were deployed at Ogurasawa stream (OGR), one of the spring points located upstream of UKER . The magnified map of the OGR is presented in the SI.…”

Section: Methodsmentioning

confidence: 99%

Application of Diffusive Gradients in Thin Films (DGT) for the Dynamic Speciation of Radioactive Cesium in Fukushima Prefecture, Japan

Tanaka,

Fukuoka,

Toda

et al. 2024

ACS EST Water

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Radioactive cesium released by the Fukushima Daiichi Nuclear Power Plant accident in March 2011 remains in the forest environment and is being transported to the ocean via residential areas by runoff into river systems. Most of the 137 Cs in river water exists as suspended forms, being strongly fixed by micaceous clay minerals. If this fraction can change its form to dissolved forms, this results in additional input of bioavailable 137 Cs. In this study, in situ sampling of 137 Cs at multiple rivers in Fukushima Prefecture was conducted using diffusive gradient in thin film (DGT) devices to investigate the dynamics of radioactive cesium in river environments. At almost all sampling points, the DGT 137 Cs concentrations exceeded the dissolved 137 Cs concentrations, revealing the existence of a flux from the suspended to the dissolved forms. This additional input was found to have higher 137 Cs/ 133 Cs ratios than those of Cs in the dissolved form. This study demonstrates that the bioavailability of 137 Cs can be underestimated by assessing only the dissolved form due to the flux of 137 Cs from the suspended particles likely caused by their dissolution.

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Section: Methodsmentioning

confidence: 99%

Application of Diffusive Gradients in Thin Films (DGT) for the Dynamic Speciation of Radioactive Cesium in Fukushima Prefecture, Japan

Tanaka,

Fukuoka,

Toda

et al. 2024

ACS EST Water

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The method of radiation risk assessment based on physico-geographical regionalisation: a case study of Carpathians, Poland

Jędrzejek,

Szarłowicz,

Stobiński

2024

Environ Sci Pollut Res

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Radiological assessment of the environment in expansive territories poses significant challenges due to the complexity of spatial and environmental variables. The aim of this study was to use and present the advantages of a physico-geographical regionalisation methodology to improve the precision and effectiveness of radiological assessments in large areas. The study area was a region of the Polish Carpathian mountains with a territory of 19,600 km2. By integrating geographic information systems (GIS) and radiological data, this research analysed a similarity of environmental attributes (soil type, lithology, mineralogy) and absorbed dose rate (ADR) level from the terrestrial origin for populations. Consistency in terms of the nature and origin of the relief and lithological diversity was a key aspect that distinguished the radiological characteristics. Therefore, consistency was observed at the macroregional level according to physiographic mapping. The study demonstrates the utility of macroregionalisation in capturing spatial ADR heterogeneity and provides a new strategy in radiological monitoring. Graphical Abstract

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Changes in air dose rates due to soil moisture content in the Fukushima prefecture forests

Cited by 2 publications

References 24 publications

Application of Diffusive Gradients in Thin Films (DGT) for the Dynamic Speciation of Radioactive Cesium in Fukushima Prefecture, Japan

Application of Diffusive Gradients in Thin Films (DGT) for the Dynamic Speciation of Radioactive Cesium in Fukushima Prefecture, Japan

The method of radiation risk assessment based on physico-geographical regionalisation: a case study of Carpathians, Poland

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