【作者】 李冬梅； 徐茂泉； 刘广山； 李超； 许文彬；

【Author】 LI Dongmei XU Maoquan LIU Guangshan LI Chao XU Wenbin College of Oceanography and Environmental Science, Xiamen University, State Key Laboratory of Marine Environmental Science in Ximen University, Xiamen, Fujian , 361005

【机构】 厦门大学海洋与环境学院近岸海洋环境科学国家重点实验室(厦门大学)；

【摘要】 用γ谱方法测定了采集自福建兴化湾外近海两个沉积物岩心中的放射性核素,探测到的核素为40K、137Cs、210Pb、226Ra、228Ra、228Th和238U,讨论了这些放射性核素的垂直分布特征,用210Pb过剩方法估算了两个采样站位所在海域的沉积速率。发现两个站位的沉积速率存在明显差异,其原因是两个站位所在海区具有不同的海洋动力环境,从而使沉积物具有不同的物质构成。本文比较了两个岩心中放射性的分布特征,探讨了其反映的沉积环境的特征,证明沉积物中放射性核素的分布与海区海洋环境存在关系。更多还原

【Abstract】 Radionuclides in two coastal sediment cores collected from the offshore area of Xinghua Bay were measured by HPGe-γ spectroscopy. The detectable nuclides are 40K, 137Cs, 210Pb, 26Ra, 228Ra, 228Th and 238U. The distribution of these nuclides was discussed and the sedimentation rates were estimated by the excess 210Pb method. The sedimentation rates of two cores are not consistent with each other, which suggests that the marine hydrodynamic environment causes difference in material constituents in cores. A comparison of the distribution features of radionuclides in cores and an investigation of sedimentary environments show that the distribution of radinuclides in cores is related to the marine environment change in the past.更多还原