Environmental radioactivity, radiological hazards, and trace elements assessment of nearshore sediment in the Bay of Bengal  

作　　者：Manikanda Bharath Karuppasamy Usha Natesan Chandrasekaran Seethapathy Srinivasalu Seshachalam 

机构地区：[1]National Institute of Technical Teachers Training and Research,Government of India,Ministry of Education,Department of Higher Education,Taramani,Chennai 600113,Tamil Nadu,India [2]Institute for Ocean Management,Anna University,Chennai 600025,Tamil Nadu,India [3]Radiological Safety Division.Quality and Resource Management Group,Health Safety and Environmental Group,Indira Gandhi Centre for Atomic Research,Homi Bhabha National Institute,Kalpakkam 603102,Tamil Nadu,India

出　　处：《International Journal of Sediment Research》2024年第1期70-82,共13页国际泥沙研究（英文版）

摘　　要：The current study focuses on the environmental radioactivity and multi-risk assessment of nearshore sediment as a source of marine pollution along the Bay of Bengal.The study examines the distribution of primordial radionuclide concentrations using a thallium-activated sodium iodide(Nal(TI))detector-based gamma-ray spectrometer and Potentially Toxic Elements(PTE)through atomic adsorption anal-ysis.The data also were used to characterize ecological threats,radiological risks,and the geospatial distribution of toxic compounds in nearshore sediment as a proxy for marine pollution.The active concentration of primordial radionuclides such as uranium-238(^(238)u),thorium-232(^(232)Th),and potassium-40(^(40)k)was found in the range from≤3 to 68(11.4),≤9.5 to 142.7(41.2),and 85.2 to 603.4(362)Bq/kg,and the results show that the average radioactive concentration of the average radionuclides was less than suggested by the United Nations Scientific Committee on the Effects of Atomic Radiation(UNSCEAR)ranges.Potentially toxic elements iron(Fe),chromium(Cr),nickel(Ni),lead(Pb),and zinc(Zn)were higher in deeper water depths.The current study reveals that mud distribution primarily controls such elements.A decreasing order has been seen as follows by the ecological risk index of in-dividual elements:copper(Cu)>lead(Pb)>nickel(Ni)>chromium(Cr)>zinc(Zn).The significant Pb,Cu,and Zn concentrations indicated high pollution at most stations,possibly resulting from regional and terrestrial sources such as industrial activity,urban drainage,manufacturing,and farming.The migration of contaminated soil from the industrial and transportation sectors may be the source of the increased levels of hazardous elements and naturally occurring radionuclides in the sediment transported into the coastal ecosystemsof Bay of Bengal.

关 键 词：Nearshore sediment Environmental radioactivity Toxic elements Potential ecological risk Geospatial tools Pollution assessment 

分 类 号：X751[环境科学与工程—环境工程] X143