摘要
海洋沉积物是放射性核素的最终归宿。本研究利用高纯锗γ谱仪探索了北部湾表层沉积物中天然放射性核素活度水平及分布特征。结果表明,北部湾表层沉积物中^(238)U、^(226)Ra、^(228)Ra、^(40)K、^(210)Pb的平均活度分别为(29.5±14.6)Bq/kg、(22.0±12.2)Bq/kg、(37.0±20.2)Bq/kg、(302±195)Bq/kg、(34.4±19.9)Bq/kg;^(228)Ra、^(40)K和总活度(AT)在水平方向上呈现由陆向海方向升高的规律。北部湾沉积物中232Th/^(238)U和^(228)Ra/^(226)Ra活度比值的特征指纹为1.2和1.5。此外,北部湾^(40)K低活度区与海砂分布高度一致,说明^(40)K可能是海洋砂矿的潜在指示剂。本研究系统定量分析了北部湾沉积物放射性水平,不仅可为未来北部湾滨海核电的辐射环境影响评估提供本底基线,而且能为今后北部湾海砂资源在线走航高效勘探提供一定的参考价值。
Marine sediments are the final destinations of radionuclides.We used a high purity germaniumγspectrometry to measure natural radionuclides and explore the spatial distribution characteristics of nuclides in the surface sediments of Beibu Gulf.The mean activities of^(238)U,^(226)Ra,^(228)Ra,^(40)K and^(210)Pb are(29.5±14.6)Bq/kg,(22.0±12.2)Bq/kg,(37.0±20.2)Bq/kg,(302±195)Bq/kg,and(34.4±19.9)Bq/kg,respectively.In the horizontal direction,^(228)Ra,^(40)K and total activity(AT)show an increasing pattern from nearshore to far offshore.Fingerprints of 232Th/^(238)U and^(228)Ra/^(226)Ra activity ratios in sediments are 1.2 and 1.5,respectively.In addition,the^(40)K low activity area in Beibu Gulf is highly consistent with the distribution of marine sands,suggesting that^(40)K may be a potential indicator of marine sands.This study systematically quantifies sediment radioactivity levels in Beibu Gulf,which not only provides a background baseline for future assessment of the radiological environmental impacts of coastal nuclear power in Beibu Gulf,but also may provide some reference value for the future on-line travelling and efficient exploration of sea sand resources in Beibu Gulf.
作者
莫敏婷
林武辉
刘昕明
MO Minting;LIN Wuhui;LIU Xinming(Institutes of Marine Drugs,Guangxi University of Chinese Medicine,Nanning 530200,China;Guangxi Key Laboratory of Marine Drugs,Nanning 530200,China;Observation and Research Station of Coastal Wetland Ecosystem in Beibu Gulf,MNR,Beihai 536015,China;Polar and Marine Research Institute,College of Harbour and Coastal Engineering,Jimei University,Xiamen 361021,China;Guangxi Key Laboratory of Nuclear Physics and Nuclear Technology,Guangxi Normal University,Guilin 541004,China)
出处
《海洋环境科学》
北大核心
2025年第4期534-542,共9页
Marine Environmental Science
基金
国家自然科学基金项目(42276044)
广西自然科学基金(2024GXNSFAA010449)
福建省环保科技计划项目(2025R004)
广西南海珊瑚礁研究重点实验室开放基金(GXLSCRSCS2023003)
中国辐射防护研究院平台开放基金项目(ZFYHHJMN-2024003)
广西核物理与核技术重点实验室开放课题(NLK2021-04)。
关键词
北部湾
沉积物
放射性核素
海砂资源
核电站
Beibu Gulf
surface sediments
radionuclides
sea sand resources
nuclear power plant
