Sources of plutonium isotopes and Cs-137 in coastal seawaters of Liaodong Bay and Bohai Strait, China and its environmental implications

作者：Hao, Yongpei; Xu, Yihong^*; Pan, Shaoming^*; Song, Xiaowei; Zhang, Kexin; Guo, Haiting; Gu, Zhi

来源：Marine Pollution Bulletin, 2018, 130: 240-248.

DOI：10.1016/j.marpolbul.2018.03.037

• (239+240)pu
• Pu-240/ Pu-239 atom ratio
• Cs-137
• Surface seawater
• Liaodong Bay
• Bohai Strait

In order to investigate the sources of plutonium in seawaters of Liaodong Bay and Bohai Strait, China, surface seawater samples were collected and analyzed for Pu-239/ Pu-240 and Cs-137 by radiochemical separation combined with ICP-MS and gamma-spectrometry, respectively. A large variation of 239+240PU activities was observed, ranging from 1.993 to 29.677 mBq/m(3) in the Liaodong Bay and from 0.932 to 10.183 mBq/m(3) in the Bohai Strait. Cs-137 activities showed little variation between the investigated locations, which was attributed to the different behavior characteristics of 239+24 degrees PU and 137 Cs in seawaters. The Pu-240/Pu-239 atom ratios showed a significant variation between the Liaodong Bay (0.185) and Bohai Strait (0.225), indicating that Pu derived from the Pacific Proving Grounds might have been transported to the Bohai Strait but not yet to the Liaodong Bay, which could further provide valuable reference for evaluating the seawater exchange cycle between the Bohai Sea and Yellow Sea.

• 出版日期2018-5
• 单位扬州大学; 南京大学