Radioactivity of Surface Marine Sediments of Chaun Bay: Analysis of Natural and Anthropogenic Factors

IF 0.3 Q4 GEOLOGY Moscow University Geology Bulletin Pub Date : 2024-06-05 DOI:10.3103/s0145875224700078

A. S. Ulyantsev, S. I. Ivannikov, S. Yu. Bratskaya, A. N. Charkin

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Abstract

The paper presents data on the spatial distribution of the active concentration of natural (²³²Th, ²²⁶Ra, and ⁴⁰K) and anthropogenic (¹³⁷Cs) radionuclides in the surface layer of bottom sediments in Chaun Bay of the East Siberian Sea. The measured active concentration of ²³²Th and ²²⁶Ra was typical of bottom sediments of the Arctic coastal shelf zone and corresponded to the global level. The level of ¹³⁷Cs activity in bottom sediments showed the absence of local sources of anthropogenic pollution in Chaun Bay, while the mean ⁴⁰K activity concentration was 1.8 times higher than the global. The results of statistical analysis of the data obtained showed that the dynamics of river runoff, thermal abrasion, and currents, as well as aeolian and ice transport of sedimentary matter, were the main factors that determined the differences in the behavior of the studied radionuclides in the surface bottom sediments of Chaun Bay.

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潮安湾表层海洋沉积物的放射性：自然和人为因素分析

摘要本文介绍了东西伯利亚海朝恩湾底层沉积物表层天然（232Th、226Ra 和 40K）和人为（137Cs）放射性核素有效浓度的空间分布数据。测量到的 232Th 和 226Ra 活性浓度是北极沿海大陆架区域底层沉积物的典型值，与全球水平相当。底层沉积物中 137Cs 活性水平表明，朝恩湾不存在本地人为污染源，而平均 40K 活性浓度是全球水平的 1.8 倍。对所获数据进行统计分析的结果表明，河流径流、热磨蚀和海流的动态变化，以及沉积物的风化和冰运移，是决定所研究的放射性核素在潮安湾表层底层沉积物中的行为差异的主要因素。

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来源期刊

Moscow University Geology Bulletin GEOLOGY-

CiteScore

0.60

自引率

25.00%

发文量

期刊介绍： Moscow University Geology Bulletin is the journal that mainly publishes scientific articles, short reports of graduate students, and reviews. Publications made by the members of the Faculty of Geology of the Moscow State University and their collaborators are published. Publications encompass all branches of geology.