放射性同位素用于港口工程中泥沙问题的分析,已有较多的实例。早期采用~(14)C方法测定土层中物质的沉积年代,但由于~(14)C放射性元素的半衰期约5730年,测定沉积年代误差较大,有时达±100～200年,因此在泥沙分析中仅具有宏观的参考价值。七十年代初期~(210)P_b方法作为一种较为精确的测年手段,开始用于湖泊、河口和海洋等底质沉积年代的测定,对 Radioisotopes have been used in the analysis of sediment problems in harbor engineering. There are many examples. In the early stage, sediment dating of material was determined by ~ (14) C method. However, since the half-life of ~ (14) C radioactive elements was about 5730 years, the sediment age was measured with large error and sometimes ± 100-200 years. Therefore, Sand analysis has only macroscopic reference value. In the early 1970s ~ (210) P_b method, as a more accurate dating method, it was used to determine sediment age in lakes, estuaries and oceans,