北部湾近岸海域海洋环境中铀钍放射性水平与生物效应评价研究

Study on the radioactive level and biological effect evaluation of uranium and thorium in the coastal marine environment of Beibu Gulf

关键词:  海水  沉积物 铀  钍 辐射环境效应

Key words:  seawater  deposit Uranium  Thorium Radiation  environmental effects

摘要:

北部湾作为中国西南最便捷的出海港湾，拥有极为丰富的渔业资源。随着网络飞速发展，政府和公众对海洋环境放射性水平的关注度越来越高，亟需对北部湾海域进行放射性水平调查和评估。本研究采用微量铀分析仪、紫外分光光度计和γ谱仪分析北部湾近岸海域海水及表层沉积物中的铀钍含量，掌握该区域铀钍浓度水平及其空间分布特征，并评估了海洋放射性环境质量和海洋辐射环境效应。结果表明，海水中铀、钍平均含量分别为2.66 μg/L、0.255 μg/L，沉积物中铀-238、钍-232的平均活度浓度分别为41.6 Bq/kg、39.7 Bq/kg，铀钍水平与南海和白龙半岛临近海域相当，处于本底水平。北部湾海域中海水及沉积物中铀钍对海洋生物基本无影响。本文为北部湾海域放射性研究提供关键基础数据，也为北部湾海域海洋辐射环境安全监管提供数据支撑和科学依据。

Abstract:

As the most convenient port in southwest China, Beibu Gulf is rich in fishery resources. With the rapid development of the network,. The government and the public are paying more and more attention to the radioactive level of the marine environment. It is urgent to investigate and evaluate the radioactive level in the Beibu Gulf sea area. In this study, trace uranium analyzer, ultraviolet spectrophotometer and γ spectrometer were used to analyze the content of uranium and thorium in seawater and surface sediments in Guangxi coastal waters. The concentration level and spatial distribution characteristics of uranium and thorium in this area were mastered, and the quality of marine radioactive environment and the effect of marine radiation environment were evaluated. The results show that the average contents of uranium and thorium in seawater are 2.66 μg / L and 0.255 μg / L, respectively. The average activity concentrations of uranium-238 and thorium-232 in sediments are 41.6 Bq / kg and 39.7 Bq / kg, respectively. The level of uranium and thorium is comparable to that of other sea areas and is at the background level. Uranium and thorium in seawater and sediments in Beibu Gulf have no effect on marine organisms. This paper provides key basic data for the study of radioactivity in the Beibu Gulf, and also provides data support and scientific basis for the safety supervision of marine radiation environment in the Beibu Gulf.