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【目的】了解广西北部湾河口及海湾沉积物中~(137)Cs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周围环境的影响提供科学依据。【方法】在广西北部湾河口及海湾中采集32个沉积物样品,利用高纯锗γ谱仪测定样品中~(137)Cs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,~(137)Cs比活度较低,范围为0.10~5.94Bq/kg,平均值约为1.23Bq/kg。【结论】表层沉积物中,~(137)Cs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,~(137)Cs吸附量相对较少导致。同时,自然因素和人为活动对~(137)Cs在河口及海湾沉积物中的再分配起重要作用。
【Objective】 The objective of this study was to understand the content of 137 Cs in the sediments of Beibu Gulf estuarine and Gulf of Guangxi and to provide a scientific basis for quantitatively studying the soil erosion and accumulation in Beibu Gulf coastal area and evaluating the impact of Fangchenggang Hongshao nuclear power plant operation on the surrounding environment. 【Method】 Thirty-two sediment samples were collected from Bayou estuary and Gulf of Guangxi, and the content of 137 Cs in the samples was determined by high-purity germanium γ spectrometer and compared with the surrounding background values. 【Result】 The results showed that the specific activity of ~ (137) Cs 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 137 Cs in surface sediments is lower than that in the terrestrial sediments. The main reason may be the sediment concentration in the sediment samples is relatively high and the relatively small amount of 137 Cs is relatively small. At the same time, natural factors and human activities played an important role in the redistribution of 137 Cs in estuaries and gulf sediments.