大连近海沉积物中放射性核素分布及环境指示
发布时间：2018-12-24 08:19
【摘要】：基于大连近海表层和柱状沉积物中放射性核素~(238)U、~(226)Ra、~(210)Pb、~(40)K和~(137)Cs比活度与分布特征分析,对大连近海的沉积环境进行讨论.结果表明,水平方向上放射性核素含量均分别处于同一水平,陆源输入特征明显;垂直方向上40K比活度随深度变化较小,~(238)U、~(226)Ra、~(210)Pb和~(137)Cs比活度随深度增加出现波动,整体上不存在物质输入的显著变化,沉积环境相对稳定;~(2~(26Ra相对于母体~(238U亏损,~(210Pb相对于母体~(2~(26Ra过剩,~(40)K和~(137)Cs之间存在显著的正相关关系.利用~(210)Pbex法和~(137)Cs法分别计算得到大连近海沉积速率为0.49和0.43cm/a.
[Abstract]:Based on the analysis of the specific activity and distribution of radionuclides ~ (238) U ~ (226) Ra,~ (210) Pb,~ (40) K and ~ (137) Cs in the surface and columnar sediments of Dalian, the sedimentary environment of Dalian offshore is discussed. The results show that the contents of radionuclides are at the same level in the horizontal direction, and the characteristics of terrestrial source input are obvious. In the vertical direction, the specific activity of 40K varies slightly with the depth. The specific activity of ~ (238) U ~ (226) Ra,~ _ (210,210) Pb and ~ (137) Cs fluctuates with the increase of depth, but there is no significant change of material input on the whole. The sedimentary environment is relatively stable; There is a significant positive correlation between ~ (2 ~ (26Ra) and parent ~ (238) U, ~ (210Pb) versus parent ~ (2 ~ (26Ra), ~ (40) K and ~ (137) Cs. By using ~ (210) Pbex method and ~ (137) Cs method, the sedimentation rates of Dalian offshore are 0.49 and 0.43 cm / a, respectively.
【作者单位】： 中国海洋大学海洋化学系;国家海洋环境监测中心;大连海洋大学海洋科技与环境学院;
【基金】：国家海洋局近岸海域生态环境重点实验室开放基金资助项目(201308) 国家海洋局海洋—大气化学与全球变化重点实验室开放基金资助项目(GCMAC1303)
【分类号】：X55
本文编号：2390390
[Abstract]:Based on the analysis of the specific activity and distribution of radionuclides ~ (238) U ~ (226) Ra,~ (210) Pb,~ (40) K and ~ (137) Cs in the surface and columnar sediments of Dalian, the sedimentary environment of Dalian offshore is discussed. The results show that the contents of radionuclides are at the same level in the horizontal direction, and the characteristics of terrestrial source input are obvious. In the vertical direction, the specific activity of 40K varies slightly with the depth. The specific activity of ~ (238) U ~ (226) Ra,~ _ (210,210) Pb and ~ (137) Cs fluctuates with the increase of depth, but there is no significant change of material input on the whole. The sedimentary environment is relatively stable; There is a significant positive correlation between ~ (2 ~ (26Ra) and parent ~ (238) U, ~ (210Pb) versus parent ~ (2 ~ (26Ra), ~ (40) K and ~ (137) Cs. By using ~ (210) Pbex method and ~ (137) Cs method, the sedimentation rates of Dalian offshore are 0.49 and 0.43 cm / a, respectively.
【作者单位】： 中国海洋大学海洋化学系;国家海洋环境监测中心;大连海洋大学海洋科技与环境学院;
【基金】：国家海洋局近岸海域生态环境重点实验室开放基金资助项目(201308) 国家海洋局海洋—大气化学与全球变化重点实验室开放基金资助项目(GCMAC1303)
【分类号】：X55
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