Historical Sr activity in seawater was established in the China seas from 1963 to 2018. Based on the exponential decrease in Sr activity in seawater, the effective half-life (EHL) of Sr was quantified to be 11.5 ± 1.6 a, 16.5 ± 2.4 a, 27.2 ± 6.2 a, and 26.7 ± 4.3 a in the Bohai Sea, Yellow Sea, East China Sea, and South China Sea, respectively. We found contrasting patterns in the EHL of Sr and Cs in the marginal seas and open oceans that were closely related to the subtly different pathways of Sr and Cs in marine environment. Additionally, we demonstrated that Fukushima-derived Sr (<0.01 Bq/m) would be difficult to identify in the China seas. Our study not only provided the key parameter of the EHL in marine models for predicting the Sr activity in the China seas in the post-Fukushima era but also enhanced our understanding of Sr behavior and its fate in marine environments.
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