Zhang Mingli, Zhao Zihan, Wang Yanhua, Chen Yan, Hou Xiaolin
School of Geography, Nanjing Normal University, Nanjing, 210023, China; Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing, 210023, China; Key Laboratory of Material Circulation and Pollution Control in Jiangsu Province, Nanjing, 210023, China.
School of Geography, Nanjing Normal University, Nanjing, 210023, China.
J Environ Radioact. 2023 May;261:107143. doi: 10.1016/j.jenvrad.2023.107143. Epub 2023 Mar 4.
Anthropogenic radionuclides deposited in sediments have been used for environmental radiation risk valuation as well as source identification. In this study, we investigated the vertical distribution of plutonium (Pu) isotopes and Pu/Pu atom ratios in both floodplain and lacustrine sediments in Poyang Lake. The Pu activity concentrations in floodplain sediment cores were found to range from 0.002 to 0.085 Bq kg, with a maximum value at the subsurface layer. The activity in lacustrine sediment cores was from 0.062 to 0.351 Bq kg with a mean of 0.138 ± 0.053 Bq kg. The inventory of 43.15 Bq m in lacustrine sediment core is comparable to the average value of global fallout expected at the same latitude. The average Pu/Pu atomic ratios (0.183 ± 0.032) for sediment cores indicated that the global fallout is the major source of Pu in the studied region. The results are of great significance to the further understanding of sources, records, and environmental impacts of regional nuclear activities in the environment.
沉积在沉积物中的人为放射性核素已被用于环境辐射风险评估以及源识别。在本研究中，我们调查了鄱阳湖漫滩和湖泊沉积物中钚（Pu）同位素的垂直分布以及Pu/Pu原子比。发现漫滩沉积物岩芯中的Pu活度浓度范围为0.002至0.085 Bq/kg，在表层具有最大值。湖泊沉积物岩芯中的活度为0.062至0.351 Bq/kg，平均值为0.138±0.053 Bq/kg。湖泊沉积物岩芯中43.15 Bq/m²的存量与同一纬度预期的全球沉降平均值相当。沉积物岩芯的平均Pu/Pu原子比（0.183±0.032）表明全球沉降是研究区域Pu的主要来源。这些结果对于进一步了解环境中区域核活动的来源、记录和环境影响具有重要意义。
