The ecological half-life of radiocesium in surficial bottom sediments of five ponds in Fukushima based on in situ measurements with plastic scintillation fibers.,Environmental Science: Processes & Impacts

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The ecological half-life of radiocesium in surficial bottom sediments of five ponds in Fukushima based on in situ measurements with plastic scintillation fibers.
Environmental Science: Processes & Impacts ( IF 4.3 ) Pub Date : 2020-07-06 , DOI: 10.1039/d0em00160k
Estiner Walusungu Katengeza ₁ , Yukihisa Sanada , Kazuya Yoshimura , Kotaro Ochi , Takeshi Iimoto

Affiliation

Plastic scintillation fibers (PSFs) have been instrumental in in situ surface contamination surveys post the Fukushima Daichi Nuclear Power Plant accident. Their deployment to monitoring bottom sediments in aquatic environments provides the spatial extent of contamination over wide areas compared to discrete points as provided traditionally by sediment sampling. This study evaluated the wide area ecological half-life (T_eco) of radiocesium concentration for surface sediments of five ponds in Fukushima using PSFs, monitoring data generated between 2013 and 2019. The least squares' regression method was employed to evaluate the T_eco. Four ponds had a T_eco ranging from 3.0 ± 0.3 years to 11.4 ± 2.3 years. A forest-catchment pond exhibited a relatively long T_eco of 41.6 ± 55 years. Local variation in the T_eco appears to be influenced by sedimentation as we demonstrated larger values for areas showing potential sedimentation in the forest catchment pond. This study demonstrates the importance of wide area in situ monitoring techniques, such as PSF, in providing an overview of the spatial-temporal trends of radiocesium in bottom sediments and confirms the importance of forests as secondary contaminant sources to their drainage.

中文翻译：

基于塑料闪烁纤维的原位测量，福岛五个池塘表层沉积物中放射性铯的生态半衰期。

在福岛第一核电站事故后，塑料闪烁纤维（PSF）有助于现场表面污染调查。与传统上通过沉积物采样提供的离散点相比，它们在水生环境中监测底部沉积物的部署提供了大范围污染的空间范围。本研究使用PSFs评估了福岛五个池塘表面沉积物的放射性铯浓度的广域生态半衰期（T _eco），监测了2013年至2019年之间产生的数据。采用最小二乘回归法评估了T _eco。四个池塘有T型_生态从3.0±0.3年到11.4±2.3年。一个森林集水池表现出相对长的Ť_生态的41.6±55岁。T _eco的局部变化似乎受到沉积的影响，因为我们证明了在森林集水池中显示潜在沉积的区域的值较大。这项研究证明了诸如PSF之类的广域原位监测技术在概述底部沉积物中放射性铯的时空趋势方面的重要性，并证实了森林作为其排水的次要污染源的重要性。

更新日期：2020-07-23

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