Characterizing regional-scale temporal evolution of air dose rates after the Fukushima Daiichi Nuclear Power Plant accident

Wainwright, H. M.; Seki, Atsushi; Mikami, Shuichi; Saitô, Kimiaki

doi:10.1016/j.jenvrad.2018.04.006

Cited by 9 publications

(5 citation statements)

References 25 publications

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“…We demonstrated our methodology using the datasets in the designated evacuation area (as of March 2017). We used the 2016 integrated map created in Wainwright et al (2018), along with other spatially extensive data, including elevation, land-cover type, and distance and direction from the NPP (Fig. 2).…”

Section: Resultsmentioning

confidence: 99%

“…In this analysis, we considered the geographical range, and also included currently known factors (i.e., land-cover type) that influence the radiocesium movement. In recent years after the migratory radiocesium has migrated, many studies have reported the spatially uniform reduction of dose rates over the region, except for a steeper decrease in the decontaminated region (Wainwright et al, 2018). This is because cesium is strongly bound to soil particles, and its mobility is quite limited in the environment.…”

Section: Methodsmentioning

confidence: 99%

“…We use the current integrated map of air dose rates as a reference map to select monitoring locations (Wainwright et al, 2018). The steps of our methodology are shown as Fig.…”

Section: Methodsmentioning

confidence: 99%

“…Currently, radiocesium ( 134 Cs and 137 Cs) is the main contaminant of concern in the environment, since it is a major contributor to air-dose rates (Saito, 2016). Many studies have documented reduction of the air dose rates faster than expected from physical decay as a result of both physical and ecological decay (Kinase et al, 2014(Kinase et al, , 2015(Kinase et al, , 2017Saito, 2016Wainwright et al, 2018). In addition, other studies have found that the extensive decontamination effort in the region has played a critical role in this recovery process (Yasutaka et al, 2013;Wainwright et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

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Optimizing long-term monitoring of radiation air-dose rates after the Fukushima Daiichi Nuclear Power Plant

Sun

Wainwright

Oroza

et al. 2020

Journal of Environmental Radioactivity

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

“…We use the current integrated map of air dose rates as a reference map to select monitoring locations (Wainwright et al, 2018). The steps of our methodology are shown as Fig.…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Optimizing long-term monitoring of radiation air-dose rates after the Fukushima Daiichi Nuclear Power Plant

Sun

Wainwright

Oroza

et al. 2020

Journal of Environmental Radioactivity

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“…It has been hypothesized that cycloid scales are helpful to reduce friction drag in the anterior part of the body, where laminar boundary layers should prevail. In contrast, in the posterior part of the body ctenoid scales help to control turbulences in the turbulent boundary layers, inhibiting separation of the layers, which in turn reduces drag (see Viertler et al, 2021; Wainwright et al, 2019). Hence, for hill stream fishes like members of the genus Garra , which are living in the fast flowing streams, it can be considered as an evolutionary advantage.…”

Section: Discussionmentioning

confidence: 99%

Scales surface topography: Comparative ultrastructural and decorative characteristics of a modern elasmoid fish scales in a cyprinid fish, Garra shamal (Teleostei: Cyprinidae) using digital optical light and scanning electron microscope imaging

Jufaili

Echreshavi

Esmaeili

2022

Microscopy Res & Technique

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The complex architecture of fish scale has been investigated for several decades to show an existing link between scale morphology/microstructure and systematic/ evolutionary relationships of fishes. In the present study, the surface architecture structure associated with the scales of a hill stream cyprinid fish Garra shamal restricted to the Hajar Mountains of the Arabian Peninsula was examined by optical light and scanning electron microscopy; (i) to describe the whole morphology, architectural design and hidden microstructures of scales in an endemic fish of the Arabian Peninsula, G. shamal, (ii) to investigate the phenotypic plasticity of scales in six selected regions of the fish body, (iii) to show an ontogenetic pattern of scale morphology in different size classes, and (iv) to study morphometric parameters for scales, and determine the most valuable indices for differentiating the scales of different body regions and the different size groups of studied species. For this purpose, scales were removed from six body regions of three size classes. The scale of G. shamal, as an ossified platelet and hard structure covering the outer part of fish in different body parts and size groups, demonstrated numerous hidden morphological and structural characteristics, and sculptural design, for example, type, shape, and size in general term, and circuli (thickness, arrangement, and relative spacing of circuli around the focus), radii (number, shape, its origin from focus), lepidonts (the texture, shape, size, orientation, and type of its attachment), and granules (shape, size, number, and configurations) in a specific term, that can contribute efficiently in fish identification and classification at the genus and species levels. Position of focus, presence of radii in all four fields of scales (anterior, posterior, and laterals) and thus tetra-sectioned type, presence of specific tubercle arrangement on the posterior region, and some scale indices can be used as a taxonomic tool in Garra identification.Moreover, scales in G. shamal demonstrated plasticity in different fish size classes, and the origin of scales on the fish body, revealing a kind of ontogenetic variation, and the importance of key scales (scales below the dorsal fin) in the lepidological studies. The quantitative and qualitative traits described here based on the optical light microscopy and electron scanning microscopy can be implemented along with

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RETRACTED CHAPTER: Spatio-Temporal Optimization of Groundwater Monitoring Network at Pickering Nuclear Generating Station

Masoudi¹,

Desnoyers²,

Grey

2023

Springer Proceedings in Earth and Environmental Sciences

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Through more than 400 wells, tritium leakage of Pickering Nuclear Generating Station has been monitored seasonally since 1999. Sampling and maintenance of monitoring wells being costly, it is required limiting number of samples while ensuring monitoring objectives. This study aims at proposing a geostatistical approach for sample reduction while meeting the monitoring objectives. So, four objectives were defined: (i) Geographical coverage. (ii) Denser sampling where tritium variability is high. (iii) Delimiting the threshold of 300 kBq/L, also (iv) the cut-off of 3000 kBq/L. These objectives were quantified using geostatistical measures, served as cost functions in heuristic optimization algorithms, implemented using scripting capacity of Isatis.neo software. The algorithm was successful in sampling optimization of 2010Q4 (fourth season) according to the first, third and fourth measures. The first measure selects spatially evenly distributed wells, necessary for unknown leakages. The third and the fourth geostatistical measures suggest sampling around a decisive tritium concentration. Considering these objectives, 22 samples were removed (totally 50 samples) while deterioration of characterization accuracy is negligible. Temporal variogram revealed tritium correlation over three years. So previously acquired samples could be used to improve the monitoring in scarcely sampled areas. But sensitivity analysis showed that samples older than four seasons do not improve the current season contamination characterization. The conditional optimization was applied to samples of 2010 (all seasons). Previous samples improved the first and the last geostatistical measure, while deteriorated the second and the third measures.

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Characterizing regional-scale temporal evolution of air dose rates after the Fukushima Daiichi Nuclear Power Plant accident

Cited by 9 publications

References 25 publications

Optimizing long-term monitoring of radiation air-dose rates after the Fukushima Daiichi Nuclear Power Plant

Optimizing long-term monitoring of radiation air-dose rates after the Fukushima Daiichi Nuclear Power Plant

Scales surface topography: Comparative ultrastructural and decorative characteristics of a modern elasmoid fish scales in a cyprinid fish, Garra shamal (Teleostei: Cyprinidae) using digital optical light and scanning electron microscope imaging

RETRACTED CHAPTER: Spatio-Temporal Optimization of Groundwater Monitoring Network at Pickering Nuclear Generating Station

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