Uranium and plutonium isotopes and their environmental implications in surface sediments from the Yangtze River catchment and estuary

237Np and 241Am as Fingerprints in the Major River Basins of Southern China and North South China Sea: A Land–Sea Perspective

“…Long-lived artificial radionuclides (especially Pu, 241 Am, and 237 Np) are not only indicators of radioactive contamination sources, but also useful tracers for understanding environmental geochemical processes because of their high particle affinity. ,, The environmental behavior of radionuclides is closely related to the environmental type, and many research studies have shown that their behavior in the marine environment is more complex. , Some studies have been conducted on coastal waters to assess radionuclide contamination and investigate various processes, − and it was found that the distribution of radionuclides in the marine environment is closely related to hydrodynamic conditions and sediment properties. It is confirmed that Pu in the Yangtze River estuary and adjacent waters is related to the distribution of terrestrial sediments and is affected by ocean currents and hydrodynamic conditions. ,, Coastal areas have unique hydrodynamic conditions, large particle flux, and special scavenging and deposition of radionuclides related to particulate matter. The South China Sea is the western part of the Pacific Ocean and one of the three major marginal seas of China.…”

“…Long-lived artificial radionuclides (especially Pu, 241 Am, and 237 Np) are not only indicators of radioactive contamination sources, but also useful tracers for understanding environmental geochemical processes because of their high particle affinity. 12,26,27 The environmental behavior of radionuclides is closely related to the environmental type, and many research studies have shown that their behavior in the marine environment is more complex. 4,28 Some studies have been conducted on coastal waters to assess radionuclide contamination and investigate various processes, 29−31 and it was found that the distribution of radionuclides in the marine environment is closely related to hydrodynamic conditions and sediment properties.…”

“…It is confirmed that Pu in the Yangtze River estuary and adjacent waters is related to the distribution of terrestrial sediments and is affected by ocean currents and hydrodynamic conditions. 27,32,33 Coastal areas have unique hydrodynamic conditions, large particle flux, and special scavenging and deposition of radionuclides related to particulate matter. The South China Sea is the western part of the Pacific Ocean and one of the three major marginal seas of China.…”

Plutonium Isotopes in the Northwestern South China Sea: Level, Distribution, Source and Deposition

“…A large number of investigations on plutonium isotopes in soil, sediments, seawater and coral in the Northern Hemisphere (Wang and Yamada, 2005;Zheng et al, 2012;Zhang et al, 2018;Xu et al, 2018;Wang et al, 2017;Liu et al, 2011Liu et al, , 2020Wu et al, 2014;Dong et al, 2010;Roviello et al, 2020;Guan et al, 2021;Yamada et al, 2021) and Southern Hemisphere (Srncik et al, 2014;Tims et al, 2016) have been J o u r n a l P r e -p r o o f 3 reported. Among of them, the marginal seas of the western Pacific Ocean, e.g.…”

Progress and Application on the Analysis of Anthropogenic Radionuclide236U

“…Sakaguchi 等 [5] 通过 AMS 研究了日本石川和广岛两 [7,9] 、沉积物 [91] 和冰芯 [92] 236 U 的研究关注点除了环境背景值数据库的建立 以及核事故影响与评价外 [93] , 目前的研究还主要集中 在通过 236 U 及其他放射性核素回溯核爆试验对当地环 境 的 影 响 . Tims 等 [88] [94] 、北大西 洋 [95] 、北冰洋 [96] [13] .…”