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中文摘要：
在海洋的运输和反应过程的时间规模能用不同一半生活的自然放射性核种被评估。在现在的学习，我们评估了微粒的住处时间在 2006 年 6 月的在 Changjiang (长江) 的反应放射性核种 7Be， 210Pbxs 和 234Th 河口，是一个高混浊河口，。在 Changjiang 河口的微粒 7Be， 234Thxs 和 210Pbxs 的住处时间被计算是 0.7 鈥 ? 0.4， 0.18 鈥 ?.1 和 0.6 鈥 ? 9.8 d 分别地。那些核种的获得的住处时间与另外的河口和海湾的那些是可比较的。为 234Thxs 和 7Be，住处时间与增加推迟的微粒物质(SPM ) 的集中减少了；然而，那些 210Pbxs 增加了。而且， 234Th 和 7Be 的清除住处时间从海岸增加了到近海，当那些 210Pbxs 减少了时。
英文摘要：
The time scale of transport and reaction processes in the ocean can be evaluated using natural radionuclides of different half-lives. In the present study, we evaluated the residence times of particulate reactive radionuclides 7Be, 210Pbxs and 234Th in the Changjiang （Yangtze River） estuary, which is a high turbidity estuary, in June, 2006. The residence times of particulate 7Be, 234Thxs and 210Pbxs in the Changjiang estuary were calculated to be 0.7-20.4, 0.184.1 and 0.6-89.8 d, respectively. The obtained residence times of those nuclides are comparable with those of other estuaries and bays. For 234Thxs and 7Be, the residence times decreased with increasing concentrations of suspended particulate matter （SPM）; however, those of 210Pbxs increased. Moreover, scavenging residence times of 234Th and 7Be increased from coast to offshore, while those of 210pbxs decreased.
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