Abstract：
This article focuses on the study of the distribution of 137Cs in the bottom sediments of Arctic rivers of the Barents Sea basin (using the example of the Nenets Autonomous Okrug, Russian Arctic). This research is relevant due to the poorly studied region and the significant number of radiation-hazardous facilities in the Arctic zone of Russia, both those currently in operation and those that are \"nuclear heritage sites\". The study of 137Cs specific activity in bottom sediments was carried out in the period from 2020 to 2023 in the rivers Chizha, Nes, Vizhas, Oma, Pechora (river delta), as well as the rivers Kolva and Usa (first and second order tributaries, respectively, of the Pechora River). A total of 199 samples were collected. In addition to 137Cs specific activity, the samples were analysed for sediment particle size distribution, organic matter content, carbonate content and ash content. The 137Cs specific activity mainly ranged from the minimum detectable specific activity to 5.4 ± 0.8 Bq·kg-1. In the Nes River basin (Kaninskaya tundra), the 137Cs content in bottom sediments reached 36.0 ± 3.2 Bq·kg-1 (in the case of lake sediments) and 22.9 ± 3.7 Bq·kg-1 (in the case of river sediments), values that are higher than those of the North-West of Russia. Considering the large area of the study area (Kaninskaya tundra, Pechora river delta, southern part of Bolshezemelskaya tundra) and the similarity of physical and chemical parameters of the studied rivers, it is possible to assume the existence of a zone of increased radionuclide content in the Nes river basin. This may be due to the runoff from the Nes River catchment area, its hydrological features, and the accumulation of 137Cs in the small fractions of bottom sediments. The results confirm the conclusions of previous soil studies in the Nes river basin. The main sources of elevated 137Cs content are global atmospheric deposition and the Chernobyl Nuclear Power Plant accident.
摘要：
本文重点研究了巴伦支海盆地北极河流底部沉积物中137Cs的分布（以涅涅茨自治Okrug为例，俄罗斯北极地区）。这项研究是相关的，因为研究不足的地区和大量的辐射危险设施在俄罗斯的北极地区，目前正在运行的那些和那些“核遗产地”。2020年至2023年在赤扎河进行了底部沉积物中137Cs比活性的研究，Nes,Vizhas,Oma,Pechora（河三角洲），以及Kolva河和美国(一阶和二阶支流，分别,Pechora河）。总共收集了199个样品。除了137Cs的特异性活性，分析样品的沉积物粒径分布，有机质含量,碳酸盐含量和灰分含量。137Cs的比活性主要从最小可检测比活性到5.4±0.8Bq·kg-1。在内斯河流域（Kaninskaya苔原），底部沉积物中的137Cs含量达到36.0±3.2Bq·kg-1（对于湖泊沉积物）和22.9±3.7Bq·kg-1（对于河流沉积物），高于俄罗斯西北部的价值观。考虑到研究区的大面积(Kaninskaya苔原，Pechora河三角洲，Bolshezemelskaya苔原的南部）以及所研究河流的物理和化学参数的相似性，可以假设Nes河流域中存在放射性核素含量增加的区域。这可能是由于Nes河集水区的径流，它的水文特征，以及少量底部沉积物中137Cs的积累。结果证实了Nes河流域先前土壤研究的结论。137Cs含量升高的主要来源是全球大气沉降和切尔诺贝利核电站事故。
