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首页> 外文期刊>Journal of Environmental Radioactivity >Detailed study of post-Chernobyl Cs-137 redistribution in the soils of a small agricultural catchment (Tula region, Russia)
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Detailed study of post-Chernobyl Cs-137 redistribution in the soils of a small agricultural catchment (Tula region, Russia)

机译：小农业集水区土壤中切尔诺贝基CS-137再分配的详细研究（图拉地区，俄罗斯）

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摘要

A detailed study of Cs-137 redistribution was conducted within a small agricultural catchment in the highly contaminated Plavsk radioactive hotspot in the Tula region of Central Russia, 32 years after the Chernobyl nuclear power plant (NPP) accident, which occurred on April 26,1986. Although more than three decades have passed since the Chernobyl NPP incident, Cs-137 contamination is high. The Cs-137 inventory varies from 67 to 306 kBq.m(-2), which is 2-6 times higher than the radiation safety standard; however, the soils remain suitable for crop cultivation. The initial Cs-137 fallout within the Plavsk radioactive hotspot was extremely heterogeneous, with a trend of decreasing Cs-137 inventories from the NW to the SE directions within the studied territory. Contemporary Cs-137 inventories are also very heterogeneous in the studied catchment. However, the trend of the initial Cs-137 fallout does not appear in the contemporary Cs-137 inventories on the slopes. Two methods of interpolation (expert-visual and automatic) were used to calculate the Cs-137 budget, revealing high similarity in their Cs-137 loss estimates; however, a large discrepancy was observed in their (137)Css gain estimates. A detailed analysis of Cs-137 redistribution revealed the importance of hollows and "plow ramparts" (positive topographic forms on the boundaries of cultivated fields) in the transport and deposition of sediments. A quarter of the total Cs-137 gain was deposited within the arable land, whereas a quarter was deposited within the non-plowing sides of the dry valley; the other half was deposited in the valley bottom. About 7-8 x 10(6) kBq of the Cs-137 inventory flowed out of the catchment area, which was only about 2% of the Cs-137 fallout after the Chernobyl NPP accident. About 89% of the total Cs-137 reserve is concentrated in the top (0-25 cm) layer of soils, regardless of land use or location within the catchment.
机译：对CS-137再分配的详细研究是在俄罗斯中部地区Tula地区的高度污染的Plavsk放射性热点中进行的小型农业集水区进行，32年4月26日发生在俄罗斯核电站（NPP）事故后32年。 。虽然自切尔诺贝尔事件发生以来三十多年来，CS-137污染很高。 CS-137库存从67到306 kbq.m（-2）不同，比辐射安全标准高2-6倍;然而，土壤仍然适合作物培养。 Plavsk放射性热点内的初始CS-137辐射极为异质，具有从NW中降低CS-137库存到所研究领域内的SE方向的趋势。当代CS-137库存在研究的集水区内也是非常异质的。然而，初始CS-137后辐射的趋势不会出现在斜坡上的当代CS-137库存中。两种插值（专业视觉和自动）的方法用于计算CS-137预算，在其CS-137损失估计中揭示了高度相似之处;然而，在其（137）CSS增益估计中观察到大规模的差异。对CS-137再分配的详细分析显示了空心和“耕地形态”（耕地界限的正面形式）在沉积物的运输和沉积中的重要性。在耕地内沉积了四分之一CS-137收益，而在干谷的非耕作侧沉积四分之一;另一半在谷底沉积在谷底。大约7-8 x 10（6）kBQ的CS-137库存流出了集水区，在切尔诺贝利的事故后，只有约2％的CS-137辐射。总CS-137储备中约89％集中在土壤上的顶部（0-25厘米），无论集水区内的土地使用或位置如何。

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