摘要
采用高纯锗γ谱仪测量连云港田湾海域表层沉积物中7种放射性核素含量水平,分析其粒度特征和放射性核素分布特征,并与我国其他海域作对比。结果表明,该海域以细颗粒沉积物为主,以悬移质泥沙搬运为主要沉积模式;沉积物中210 Pb、238 U、228 Ra、40 K、226 Ra、228 Th、137 Cs的测定均值分别为50.89 Bq/kg、39.98 Bq/kg、46.70 Bq/kg、898.72 Bq/kg、25.20 Bq/kg、51.65 Bq/kg、2.01 Bq/kg,虽然比活度变化较大,但总体处于一个水平;每个采样点位各核素出现的极大值有所不同,与离岸距离无明显关系;铀系、钍系衰变系列核素的放射性均呈现出一定的衰变不平衡性;沉积物中40 K含量明显高于我国其他海域,137 Cs含量明显低于渤海湾,总体高于其他南部海域,与以往研究结论基本一致。
The contents of 7 kinds of radionuclides in the surface sediments of Tianwan sea area in Lianyungang were measured by high purity germaniumγspectrometer.The characteristics of particle size and the distribution of the radionuclides were analyzed.The results showed that fine practical sediment was dominated,and suspended sediment transport was the main sedimentary model.The mean values of 210 Pb,238 U,228 Ra,40 K,226 Ra,228 Th and 137 Cs were 50.89 Bq/kg,39.98 Bq/kg,46.70 Bq/kg,898.72 Bq/kg,25.20 Bq/kg,51.65 Bq/kg and 2.01 Bq/kg respectively.Although the specific activity varied greatly,they were generally at a level.The maximum value of each nuclide at each sampling site was different and had no obvious relationship with the offshore distance.The ratios of 226 Ra/238 U,210 Pb/226 Ra and 228 Th/228 Ra showed uranium and thorium decay series were in disequilibrium in the surface sediments.The content of 40 K was significantly higher than that in other sea areas of China.The content of 137 Cs was significantly lower than that in Bohai Bay area.Generally,the radionuclide contents were higher than that in other south sea area.The conclusion was basically consistent with the previous research.
作者
左书华
韩志远
谢华亮
李怀远
黄玉新
ZUO Shu-hua;HAN Zhi-yuan;XIE Hua-liang;LI Huai-yuan;HUANG Yu-xin(Tianjin Research Institute for Water Transport Engineering,National Engineering Laboratory for Port Hydraulic Construction Technology,Key Laboratory of Engineering Sediment of Ministry of Transport,Tianjin 300456,China)
出处
《环境监测管理与技术》
CSCD
2019年第6期42-45,共4页
The Administration and Technique of Environmental Monitoring
基金
中央级公益性科研院所基本科研业务费专项资金资助项目(TKS170202)
上海市科技创新行动计划基金资助项目(19DZ1204300)
关键词
放射性核素
γ能谱分析
表层沉积物
田湾海域
连云港
Radioactive nuclide
γenergy disperse spectroscopy
Surface sediments
Tianwan sea area
Lianyungang
