A detailed study of ¹³⁷Cs 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, ¹³⁷Cs contamination is high. The ¹³⁷Cs 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 ¹³⁷Cs fallout within the Plavsk radioactive hotspot was extremely heterogeneous, with a trend of decreasing ¹³⁷Cs inventories from the NW to the SE directions within the studied territory. Contemporary ¹³⁷Cs inventories are also very heterogeneous in the studied catchment. However, the trend of the initial ¹³⁷Cs fallout does not appear in the contemporary ¹³⁷Cs inventories on the slopes. Two methods of interpolation (expert-visual and automatic) were used to calculate the ¹³⁷Cs budget, revealing high similarity in their ¹³⁷Cs loss estimates; however, a large discrepancy was observed in their ¹³⁷Cs gain estimates. A detailed analysis of ¹³⁷Cs 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 ¹³⁷Cs 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 × 10⁶ kBq of the ¹³⁷Cs inventory flowed out of the catchment area, which was only about 2% of the ¹³⁷Cs fallout after the Chernobyl NPP accident. About 89% of the total ¹³⁷Cs reserve is concentrated in the top (0–25 cm) layer of soils, regardless of land use or location within the catchment.

在1986年4月26日切尔诺贝利核电站（NPP）事故发生32年后，在俄罗斯中部图拉地区污染严重的Plavsk放射性热点的一个小型农业流域内，对¹³⁷ Cs的重新分布进行了详细研究。尽管切尔诺贝利核电站事故已经过去了三十多年，但¹³⁷ Cs的污染仍然很高。的^137个Cs的库存从67到306 KBQ·^米变化^-2，比辐射安全标准2-6倍; 但是，土壤仍然适合农作物种植。Plavsk放射性热点内最初的¹³⁷ Cs沉降非常不均匀，趋势是减少¹³⁷ Cs在研究区域内，从西北到东南方向的CS清单。在所研究的流域，当代¹³⁷ Cs清单也非常不同。但是，最初的¹³⁷ Cs沉降的趋势并未出现在斜坡上的当代¹³⁷ Cs清单中。两种插值方法（专家视觉和自动插值法）用于计算¹³⁷ Cs预算，这显示了¹³⁷ Cs损失估算的高度相似性。然而，在他们的¹³⁷ Cs增益估计中观察到很大的差异。¹³⁷详细分析Cs的重新分布揭示了凹陷和“犁壁垒”（耕地边界上的正形地形）在沉积物的运输和沉积中的重要性。在¹³⁷ Cs的总收益中，有四分之一沉积在耕地内，而四分之一则沉积在旱谷的非耕作侧。另一半沉积在山谷底部。¹³⁷ Cs存量中约有7–8×10 ⁶ kBq流出集水区，这仅是切尔诺贝利核电厂事故后¹³⁷ Cs沉降的2％。不论土地用途或流域内的位置如何，总¹³⁷ Cs储量中约有89％集中在土壤的顶层（0–25 cm）。