Nuclide-specific activity and sediment grain size were analyzed at locations along the North Branch of the Yangtze (Changjiang) Estuary. The spatial distributions of various radioisotopes are presented, along with the sources and applications of these nuclides for studies of the aquatic environment. The specific activities of sediment radionuclides in the North Branch increase toward the ocean, indicating that the sediment is transported from the downstream side of the estuary into the North Branch. The 226Ra/228Ra ratio agrees well with the observed results and can be used to identify trends in erosion and accretion in the North Branch.
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机译：在长江（长江）河口北支沿线分析了核素比活度和沉积物粒径。介绍了各种放射性同位素的空间分布，以及这些核素的来源和在水生环境研究中的应用。北分支中沉积物放射性核素的比活度向海洋增加，表明沉积物从河口下游输送到北分支中。 226 Ra / 228 Ra比值与观察到的结果吻合良好，可用于识别北分支的侵蚀和增生趋势。
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