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用MnO2－纤维富集大体积水样中的Ra同位素，并用直接射气法测定（226）Ra和（228）Ac的（226）β计数法测定（228）Ra的方法，研究了九龙江河口区（226）Ra、（228）Ra的行为，结果表明：在该河口区（226）Ra、（226）Ra均呈非保守行为，（226）Ra、（228）Ra的最高值分别在盐度为19和9处测得。（228）Ra／（226）Ra）A.R。值在盐度小于19的区域约为3左右。与世界其他河口区相比，九龙江河口区的（226）Ra、（228）Ra有两个特征：其一是（226）Ra、（228）Ra的最大值较高；其二是（228）Ra／（226）A.R。值高于世界平均水平，本文对此进行了分析与讨论。
The Ra isotopes of bulk water samples were enriched with MnO2-fibers and the (228) Ra method was determined by the direct gas-jet method (226) Ra and (228) Ac counting methods. The results of Ra and (228) Ra in the estuary (226) show that the Ra and the (226) Ra in the estuary (226) are all non-conservative. The highest values of (226) Ra and Salinity measured at 19 and 9. (228) Ra / (226) Ra) A.R. The value of salinity in the area is less than 19 about 3 or so. Compared with other estuarine areas in the world, (226) Ra and (228) Ra in the Jiulong River Estuary have two characteristics: one is (226) Ra and the other is ( 228) Ra / (226) AR. The value is higher than the world average, this article has carried on the analysis and the discussion.