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【目的】了解广西北部湾河口及海湾沉积物中137Cs的含量,为定量研究北部湾沿岸区域土壤侵蚀和堆积状况以及评价防城港红沙核电站运行对环境影响提供科学依据。【方法】在河口及海湾中采集32个沉积物样品,利用高纯锗γ谱仪测定样品中137Cs的含量,并与周边的背景值进行比较。【结果】在河口、海湾的表层样中,137Cs比活度较低,范围为0.10~5.94Bq/kg,平均值约为1.23 Bq/kg。【结论】表层沉积物中,137Cs含量相对陆地含量要低,主要原因可能是沉积物样品中含沙量大,137Cs吸附量相对较少导致。同时,自然因素和人为活动对137Cs在河口及海湾沉积物中的再分配起重要作用。
【Objective】 The purpose of this study was to understand the content of 137Cs in the estuaries and gulfs of Beibu Gulf in Guangxi and to provide a scientific basis for quantitatively studying the soil erosion and accumulation in the Beibu Gulf coastal area and evaluating the impact of the operation of the Fangshagang Hongsha nuclear power plant on the environment. 【Method】 Thirty-two sediment samples were collected from estuaries and gulfs. The content of 137Cs in samples was determined by high purity germanium γ spectrometer and compared with the background values. 【Result】 The results showed that the specific activity of 137Cs was lower in the estuaries and gulfs, ranging from 0.10 to 5.94 Bq / kg with an average of 1.23 Bq / kg. 【Conclusion】 The content of 137Cs in the surface sediments is lower than that in the land. The main reason may be that sediment samples contain large amount of sediment and 137Cs adsorption amount is relatively small. At the same time, natural and anthropogenic activities play an important role in the redistribution of 137Cs in estuaries and gulf sediments.