Depth profile and mobility of 129I and 137Cs in soil originating from the Fukushima Dai-ichi Nuclear Power Plant accident
Depth profile and mobility of 129I and 137Cs in soil originating from the Fukushima Dai-ichi Nuclear Power Plant accident
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DOI：
10.1016/j.jenvrad.2015.03.029
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发表时间：
2015-08-01
影响因子：
2.3
通讯作者：
Nagai, Hisao
中科院分区：
文献类型：
--
作者：
Honda, Maki;Matsuzaki, Hiroyuki;Nagai, Hisao
FDNPP事故产生的1291在表层附近被清楚地识别出来，并显示出随深度迅速减少的趋势。FDNPP I-129和Cs-137分别为51.6 +/-1.7 mBq cm（-2）和88.2 +/-27.1 kBq cm（-2）（四个核心库存的平均值）。平均而言，91%的FDNPP I-129存在于顶部5g cm（-2）内，98%存在于顶部10g cm（-2）内，并且平均100%的FDNPP Cs-137存在于顶部5g cm（-2）内。根据对同一高地（川内村，距FDNPP西南方向20公里）深度剖面随时间变化的观测，估计FDNPP I-129和FDNPP Cs-137的向下迁移速率分别为0.81 +/-0.32 g cm（-2）yr（-1）和0.19 +/-0.17 g cm（-2）yr（-1）。一个简单的扩散模型被用来评估FDNPP衍生的I-129和Cs-137的向下迁移率。测得I-129和Cs-137的表观扩散系数D分别为0.0086 +/-0.0034和0.0011 +/-0.0010 g（2）cm（-1）d。这些值可能代表了湿润温带气候条件下处于近稳定状态的浅成灰低地土壤。(C)2015爱思唯尔有限公司版权所有。
The 1291 derived from the FDNPP accident were clearly identified near the surface and showed a trend of rapid decrease with depth. The FDNPP I-129 and Cs-137 was 51.6 +/- 1.7 mBq cm(-2) and 88.2 +/- 27.1 kBq cm(-2) (average of four cores inventory) respectively. On average, 91% of the FDNPP I-129 existed within the top 5 g cm(-2) and 98% within the top 10 g cm(-2) and average of 100% of the FDNPP Cs-137 existed within the top 5 g cm(-2). From the observation of the temporal variation of depth profiles from the same upland field (Kawauchi village, 20 km away from the FDNPP to the southwest direction), downward migration rates of 0.81 +/- 0.32 g cm(-2) yr(-1) for the FDNPP I-129 and 0.19 +/- 0.17 g cm(-2) yr(-1) for the FDNPP Cs-137 were estimated. A simple diffusion model was introduced to evaluate the downward mobility of the FDNPPderived I-129 and Cs-137. The apparent diffusion coefficients D of 0.0086 +/- 0.0034 and 0.0011 +/- 0.0010 g(2) cm(-1) d were obtained for I-129 and Cs-137, respectively. These values might be representative for Haplic Gray lowland soils in near the steady state under humid temperate climate. (C) 2015 Elsevier Ltd. All rights reserved.