Yakovlev Evgeny, Puchkov Andrey, Druzhinin Sergey
N. Laverov Federal Center for Integrated Arctic Research of Ural Branch of the Russian Academy of Sciences, 109 Severnoj Dviny Emb., Arkhangelsk 163000, Russia.
N. Laverov Federal Center for Integrated Arctic Research of Ural Branch of the Russian Academy of Sciences, 109 Severnoj Dviny Emb., Arkhangelsk 163000, Russia.
Mar Pollut Bull. 2023 Apr;189:114809. doi: 10.1016/j.marpolbul.2023.114809. Epub 2023 Mar 11.
This article is devoted to the study of the activity of technogenic Cs and Sr, as well as natural radionuclides K, Th and Ra in bottom sediments of the Kola coast of the Barents Sea, where a significant number of radiation objects are concentrated. In order to characterize and assess the accumulation of radioactivity in the bottom sediments, we studied the particle size distribution and some physicochemical parameters, such as the content of organic matter, carbonates and ash components. The average activities of natural radionuclides Ra, Th and K were 325.0, 25.1 and 466.7 Bq·kg, respectively. Levels of natural radionuclides in the coastal zone of the Kola Peninsula are within the range of marine sediments worldwide. Still, they are slightly higher than those observed in the central areas of the Barents Sea, most likely due to the formation of coastal bottom sediments as a result of the destruction of the natural radionuclide-enriched crystalline basement rocks that make up the Kola coast. The average activities of technogenic Sr and Cs in the bottom sediments of the Kola coast of the Barents Sea are 3.5 and 5.5 Bq·kg, respectively. The highest activities of Sr and Cs were found in the bays of the Kola coast, while they remain below detection limits in the open parts of the Barents Sea. Despite the presence of potential sources of radiation pollution in the coastal zone of the Barents Sea, we did not find any short-lived radionuclides in the bottom sediments, which indicates the absence of a significant influence of local sources on the transformation of the technogenic radiation background. The study of particle size distribution and physicochemical parameters showed that the accumulation of natural radionuclides is largely related to the content of organic matter and carbonates, while the accumulation of technogenic isotopes occurs in the composition of organic matter and the smallest fractions of bottom sediments.
本文致力于研究巴伦支海科拉海岸底部沉积物中人为源铯和锶以及天然放射性核素钾、钍和镭的活度，该区域集中了大量辐射源。为了表征和评估底部沉积物中放射性的积累情况，我们研究了粒度分布以及一些物理化学参数，如有机质、碳酸盐和灰分成分的含量。天然放射性核素镭、钍和钾的平均活度分别为325.0、25.1和466.7 Bq·kg。科拉半岛沿海区域天然放射性核素的水平在全球海洋沉积物的范围内。不过，它们略高于在巴伦支海中部地区观测到的水平，这很可能是由于构成科拉海岸的富含天然放射性核素的结晶基底岩石遭到破坏，从而形成了沿海底部沉积物。巴伦支海科拉海岸底部沉积物中人为源锶和铯的平均活度分别为3.5和5.5 Bq·kg。在科拉海岸的海湾中发现了最高的锶和铯活度，而在巴伦支海的开阔区域它们仍低于检测限。尽管巴伦支海沿海区域存在潜在的辐射污染源，但我们在底部沉积物中未发现任何短寿命放射性核素，这表明当地源对人为辐射本底的转化没有显著影响。粒度分布和物理化学参数的研究表明，天然放射性核素的积累在很大程度上与有机质和碳酸盐的含量有关，而人为同位素的积累则发生在有机质和底部沉积物的最细颗粒部分。
