Pu and <'137>Cs were evaluated in soils of un-cultivated grassland around Japan's first commercial nuclear fuel r'/> Migration rates and distribution coefficients of fallout <'239+240>Pu and <'137>Cs, and natural<'210>Pb in soils of un-cultivated grassland around the nuclear fuel reprocessing plant in Rokkasho, Japan
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首页> 外文会议>Biogeochemistry of Trace Elements: Environmental Protection, Remediation and Human Health international Symposium >Migration rates and distribution coefficients of fallout <'239+240>Pu and <'137>Cs, and natural<'210>Pb in soils of un-cultivated grassland around the nuclear fuel reprocessing plant in Rokkasho, Japan
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Migration rates and distribution coefficients of fallout <'239+240>Pu and <'137>Cs, and natural<'210>Pb in soils of un-cultivated grassland around the nuclear fuel reprocessing plant in Rokkasho, Japan

机译：日本六甲庄核燃料后处理厂周围未耕种草地中<239> +239> +> Pu和<137> Cs以及天然<210> Pb的沉降速率和分布系数

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Vertical migration rates and distribution coefficient (K<,d>) of fallout <'239+240>Pu and <'137>Cs were evaluated in soils of un-cultivated grassland around Japan's first commercial nuclear fuel reprocessing plant in Rokkasho, Japan, for understanding their behaviors and mobility in the soil. Anthropogenic <'210>Pb originating from atmospheric deposition was also examined for comparison with those nuclides. Migration rates of <'239+240>Pu, <'137>Cs and <'210> Pb were estimated to be 0.08-0.34, 0.10-0.30 and 0.09-0.31cm·y<'-1>, respectively, from the vertical distribution and deposition histories of these nuclides. The K<,d> values for Pu, <'137>Cs and <'210>Pb ranged 1.3×10<'2>-1.5×10<'3>, 9.1×10 <'1>-1.6×10<'3> and 9.1×10<'1>-1.6×10<'3>, respectively. Although the present K<,d> values of Pu and <'137>Cs for fallout radionuclides were within the range of reported values, our data were in lower side, indicating faster migration rates. The K<,d> value of <'210>Pb was approximately one order of magnitude lower than the reported value of stable Pb. The K<,d> of Pu and <'137>Cs values exponentially increased with ignition losses of the soils, showing their slower mobility in soil with higher organic matter content.
机译：在日本Rokkasho的日本第一家商业化核燃料后处理厂附近的未耕种草地的土壤中，对沉降的'239 + 240> Pu和<137> Cs的垂直迁移速率和分布系数（K <，d>）进行了评估，了解它们在土壤中的行为和流动性。还检查了源自大气沉积的人为造成的210 Pb与那些核素的比较。据估计，'239 + 240> Pu，<'137> Cs和<'210> Pb的迁移速率分别为0.08-0.34、0.10-0.30和0.09-0.31cm·y'-1。这些核素的垂直分布和沉积历史。 Pu，<'137> Cs和<'210> Pb的K <，d>值在1.3×10 <2> -1.5×10 <'3>，9.1×10 <'1> -1.6×10 <分别为'3>和9.1×10 <'1> -1.6×10 <'3>。尽管目前的放射性核素的Pu和137 Cs的K，d值在报道值的范围内，但我们的数据偏低，表明迁移速率更快。 210 Pb的K d值比稳定Pb的报告值低约一个数量级。 Pu和<137> Cs的K d值随土壤的着火损失呈指数增加，表明它们在有机物含量较高的土壤中的迁移率较慢。

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