陆丰核电周边海域表层沉积物放射性核素比活度水平研究初探  

A preliminary study of radioactivity level of surface sediments in the coastal area of Lufeng nuclear power plant

作　　者：赵峰[1] 吴梅桂[1] 李冬梅[1] 周鹏[1] 谷河泉[1] 娄全胜[1] ZHAO Feng;WU Mei-gui;LI Dong-mei;ZHOU Peng;GU He-quan;LOU Quan-sheng(South China Sea Environmental Monitoring Center,State Oceanic Administration/Nansha Islands Coral Reef Ecosystem National Observation and Research Station,Hainan/Key Laboratory of Marin Environmental Survey Technology and Application,Ministry of Natural Resources,Guangzhou 510300,China)

机构地区：[1]国家海洋局南海环境监测中心,海南南沙珊瑚礁生态系统野外科学观测研究站,自然资源部海洋环境探测技术与应用重点实验室,广东广州510300

出　　处：《海洋环境科学》2022年第1期80-84,共5页Marine Environmental Science

基　　金：国家海洋局南海分局局长基金(180104)。

摘　　要：本文采用γ能谱法对陆丰核电周边海域表层沉积物中的放射性核素进行分析测定。研究表明,陆丰核电周边海域表层沉积物样品中的铀系核素衰变不平衡:^(210)Pb相对于^(226)Ra过剩;^(226)Ra相对于^(238)U缺损。钍系核素^(228)Th和^(228)Ra则接近衰变平衡。与我国部分海域沉积物放射性含量相比,陆丰核电周边海域表层沉积物样品中核素^(238)U、^(228)Th的放射性比活度值位于中等水平,其余核素(^(40)K、^(226)Ra、^(210)Pb、^(228)Ra、^(137)Cs)的比活度值均接近于南海东北部表层沉积物核素比活度值。总体而言,研究海域表层沉积物样品放射性水平与历史数据无明显差异,处于本底范围。Radionuclides in the surface sediments from Lufeng nuclear power plant and its adjacent sea area of the South China Sea were measured usingγspectroscopy method.It was shown that the uranium decay series were in disequilibrium in the surface sediments,where ^(210)Pb relative of ^(226)Ra were excess and ^(226)Ra relative of ^(238)U were deficient.Meanwhile,the thorium decay series were close to decay equilibrium.Compared with the radioactive content of sediments in some sea areas of China,the specific activity of ^(238)U and ^(228)Th were at medium level.The content of ^(40)K,^(226)Ra,^(210)Pb,^(228)Ra and ^(137)Cs were close to sediment of the northeastern South China Sea.In a whole,the radioactivity level of sediments from Lufeng nuclear power plant and its adjacent sea area had no significant difference with historical data and was in the normal background range.

关 键 词：Γ能谱法 表层沉积物 比活度 放射性不平衡 陆丰核电站 

分 类 号：P736[天文地球—海洋地质] X125[天文地球—海洋科学]