Discussion of scavenging mechanism and spatial migration simulation for Pu and Np in South China Sea
Pu and Np are radioactive elements in marine environments,derived from human nuclear activities.They are enriched in marginal sea areas due to the multi-effect caused by ocean currents,and land-sea interaction,which threatens people's nuclear environment safety.However,there is no systematic research on Pu and Np in the ocean in China and abroad,and the research method is limited to concentration analyses.In order to study the influence of runoff input,terrain,climate,and other factors on the scavenging efficiency of Pu and Np,this paper uses sector field inductively coupled plasma mass spectrometry(SF-ICP-MS)to accurately analyze the activities of Pu and Np,as well as the atomic ratios of 240Pu/239Pu and 237Np/239Pu in seawaters and sediments of the South China Sea.The diffusion of Pu and Np in the ocean was studied on the basis of a simulated marine environment experiment and a sequential extraction experiment.The key parameters describing the transmission characteristics and migration/diffusion of Pu and Np in the seawater of the South China Sea were obtained by fitting the content and isotope atomic ratios distribution data of Pu and Np in water,particulate matter,and sediment to explain the scavenging mechanism of the Pu and Np in the seawater of South China Sea.Finally,according to the obtained data,a dynamic simulation model(S-ADE)of the spatial distribution and scavenging mechanisms of Pu,Np in the South China Sea was established,and the cross-validation of the model was carried out by experimental and field sample analyzing data.The study can provide solutions for the rapid analysis and comprehensive assessment of the origin and migration of Pu,Np and other radioactive pollutants in nuclear accidents,as well as for the protection and management of radioactive contamination.
South China SeaPu and Npmigration and diffusionscavenging processmodel simulation
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