Institute of Polar Environment, University of Science and Technology of China, Hefei, Anhui, China.
J Environ Radioact. 2010 May;101(5):362-8. doi: 10.1016/j.jenvrad.2010.02.004. Epub 2010 Mar 25.
Several natural and anthropogenic radionuclides ((210)Pb, (226)Ra and (137)Cs) in guano-phosphatic coral sediments and pure guano particles collected from Ganquan, Guangjin, Jinqing and Jinyin Islands of the Xisha archipelago, South China Sea, were analyzed. The Constant Initial Concentration (CIC) model and the Constant Rate of Supply (CRS) model were applied for age calculation. The average supply rate of (210)Pb was 126 Bq m(-2) a(-1), very close to the flux of northern hemisphere average (125 Bq m(-2) a(-1)). The activities of anthropogenic radionuclides in the sediments were very low, indicating that human nuclear tests did not notably impact this region. The main source of radionuclides in the sediments was from atmospheric precipitation, and the organic matter derived from plant and produced by nutrient-rich guano could further enhance them.
对采自中国南海西沙群岛甘泉、金银、晋卿和广金岛的鸟粪磷块岩沉积物和纯鸟粪颗粒中的几种天然和人为放射性核素（(210)Pb、(226)Ra 和 (137)Cs）进行了分析。应用恒定初始浓度（CIC）模型和恒定供应率（CRS）模型进行年龄计算。(210)Pb 的平均供应率为 126 Bq m(-2) a(-1)，非常接近北半球平均值（125 Bq m(-2) a(-1)）。沉积物中人为放射性核素的活度非常低，表明人类核试验对该地区没有显著影响。沉积物中放射性核素的主要来源是大气降水，而富含营养的鸟粪所产生的植物源有机质可以进一步增强它们。
