UCD School of Physics, University College Dublin, Belfield, Dublin 4, Ireland.
J Environ Radioact. 2011 May;102(5):495-9. doi: 10.1016/j.jenvrad.2010.09.003. Epub 2010 Oct 13.
The chronologies and sediment accumulation rates for a lake sediment sequence from Lough Carra (Co. Mayo, western Ireland) were established by applying the constant initial concentration (CIC) and constant rate of supply (CRS) hypotheses to the measured (210)Pb(excess) profile. The resulting chronologies were validated using the artificial fallout radionuclides (137)Cs and (241)Am, which provide independent chronostratigraphic markers for the second half of the 20th century. The validity of extrapolating the derived CIC and CRS dates below the (210)Pb dating horizon using average sedimentation rates was investigated using supplementary paleolimnological information and historical data. Our data confirm that such an extrapolation is well justified at sites characterised by relatively stable sedimentation conditions.
对来自爱尔兰西部梅奥郡卡洛湖（Lough Carra）的湖泊沉积物序列进行了测年和沉积速率研究，采用恒定初始浓度（CIC）和恒定供给速率（CRS）假设对测量的（210）Pb（过剩）剖面进行了分析。使用人工放射性核素（137）Cs 和（241）Am 对得到的年代序列进行了验证，这些核素为 20 世纪后半叶提供了独立的年代地层标记。通过使用平均沉积速率来推断 CIC 和 CRS 日期在（210）Pb 测年界限以下的有效性，使用了补充的古湖泊学信息和历史数据进行了研究。我们的数据证实，在相对稳定的沉积条件下，这种推断是合理的。
