Agricultural and Biological Sciences: Aquatic Science
; Earth and Planetary Sciences: Oceanography
; Environmental Science: Pollution
英文摘要:
The activities of the natural radionuclides (238U,232Th,226Ra and40K) of the surface sediments in the Yangtze Estuary were determined and used to evaluate radiation hazards in the study area. The of activities of238U,232Th,226Ra and40K ranges from 14.1 to 62.3, 26.1 to 71.9, 13.7 to 52.3, and 392 to 898�Bq�kg−�1, respectively, which were comparable to values of other regions in China. The activities of232Th,40K and226Ra were clearly different from the global recommended values. The radium equivalent activity was less than the recommended limit of 370�Bq�kg−�1; therefore, the sediment in this area can be safely used for reclamation. The external hazard index values were less than one. The average absorbed gamma dose rate and annual effective dose equivalent values were slightly greater than the world average value.226Ra/238U and232Th/238U ratios could potentially be applied for tracing sediment source. � 2016 Elsevier Ltd