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首页> 外文期刊>Environmental Science & Technology >Time Dependence of the ~(137)Cs Concentration in Particles Discharged from Rice Paddies to Freshwater Bodies after the Fukushima Daiichi NPP Accident
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Time Dependence of the ~(137)Cs Concentration in Particles Discharged from Rice Paddies to Freshwater Bodies after the Fukushima Daiichi NPP Accident

机译：福岛第一核电站事故后从稻田排入淡水体的颗粒中〜（137）Cs浓度的时间依赖性

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摘要

The concentration of particulars ~(137)Cs in paddy fields, which can be a major source of ~(137)Cs entering the water system, was studied following the Fukushima Daiichi Nuclear Power Plant accident. To parametrize the concentration and to estimate the time dependence, paddy fields covering various levels of ~(137)Cs deposition were investigated over the period 2011-2013 (n = 121). The particulate ~(137)Cs concentration (kBq kg_(-SS)~(-1)) showed a significant correlation with the initial surface deposition density (kBq m~(-2)). This suggests that the entrainment coefficient (m~2 kg_(-SS)~(-1)), defined as the ratio between the particulate ~(137)Cs concentration and the initial surface deposition density, is an important parameter when modeling ~(137)Cs wash-off from paddy fields. The entrainment coefficient decreased with time following a double exponential function. The decrease rate constant of the entrainment coefficient was clearly higher than that reported for other land uses and for river water. The difference in the decrease rates of the entrainment coefficient suggests that paddy fields play a major role in radiocesium migration through the water system. An understanding of the decrease rate of the entrainment coefficient of paddy fields is therefore crucial to understand the migration of radiocesium in the water system.
机译：在福岛第一核电站事故之后，研究了稻田中〜（137）Cs的浓度，这可能是〜（137）Cs进入水系统的主要来源。为了参数化浓度并估计时间依赖性，在2011-2013年间（n = 121）调查了覆盖各个水平〜（137）Cs沉积的稻田。颗粒〜（137）Cs浓度（kBq kg _（-SS）〜（-1））与初始表面沉积密度（kBq m〜（-2））呈显着相关。这表明当〜（137）Cs浓度与初始表面沉积密度之比时，夹带系数（m〜2 kg _（-SS）〜（-1））是一个重要参数。 137）从稻田中洗净铯。跟随双指数函数，夹带系数随时间减小。夹带系数的下降速率常数明显高于其他土地用途和河水的下降速率常数。夹带系数下降率的差异表明，稻田在放射性铯通过水系统的迁移中起主要作用。因此，了解稻田夹带系数的降低速率对于了解放射性铯在水系统中的迁移至关重要。

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  • 来源
    《Environmental Science & Technology》 |2016年第8期|4186-4193|共8页
  • 作者

    Kazuya Yoshimura; Yuichi Onda; Taeko Wakahara;

  • 作者单位

    Sector of Fukushima Research and Development, Japan Atomic Energy Agency, Sahei Building 8F 1-29, Okitama-cho, Fukushima-shi, Fukushima 960-8034, Japan ,Center for Research in Isotopes and Environmental Dynamics, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8572, Japan;

    Center for Research in Isotopes and Environmental Dynamics, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8572, Japan;

    Institute of Symbiotic Science and Technology, Tokyo University of Agriculture and Technology, 3-5-8, Saiwai-cho, Fuchu, Tokyo 183-8509, Japan;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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