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用HPGeγ谱仪测定了南海东北部表层沉积物中的放射性核素 .结果给出 7种核素的平均比活度分别为40 K :538Bq/kg ,2 10 Pb :1 1 6Bq/kg ,2 2 6Ra:2 7 7Bq/kg ,2 2 8Ra:4 4 9Bq/kg ,2 2 8Th :4 2 0Bq/kg ,2 38U :35 4Bq/kg和137Cs:1 1 6Bq/kg ,2 10 Pb的比活度随离岸距离增大 ,2 2 6Ra比活度随离岸距离没有明显变化 ,其余核素比活度随离岸距离减小 .与对我国近海其他海域报道的沉积物放射性核素含量相比 ,40 K和137Cs稍低于其他海域 ,其余核素为中等水平 .
The radionuclides in the surface sediments of the northeastern South China Sea were measured by HPGe gamma spectrometer.Results The average specific activities of the seven nuclides were 40 K: 538 Bq / kg, 2 10 Pb: 1 6Bq / kg, 2 2 6Ra: 2 7 7Bq / kg, 2 2 8Ra: 4 4 9Bq / kg, 2 2 8Th: 4 2 0Bq / kg, 2 38U: 35 4Bq / kg and 137Cs: 1 1 6Bq / kg, The activity increased with the distance from the shore, and the specific activity of 226Ra did not change significantly with the distance from the shore, and the specific activity of the other nuclides decreased with the distance from the shore.The radionuclide content of the sediments reported in other waters off the coast of China Compared with 40 K and 137 Cs slightly lower than the other waters, the rest of the nuclides were medium level.