Nuclear Studies of Accumulating and Ablation Ice Using Cosmogenic 14c

该奖项旨在支持一项研究，该研究旨在建立一种定量核方法，以确定南极的消融和积累速率，并为使用捕获的碳14测定冰样的碳14年龄提供校正因子。最近的研究已经确定在极地冰中存在宇宙成因的原位产生的碳14。结合估算的碳14生成速率，每克冰产量中碳14的测量浓度，消融速率，这些值与从木桩测量中确定的值非常一致。测定累积速率的类似研究已经过测试，其估计与以前的研究一致。本研究将扩大迄今为止所做的初步工作，通过降低空白水平和获得更完全的14CO和14CO2分离来改进14CO和14CO2真空提取技术。

This award is for support of a study to establish a quantitative nuclear method for determination of Antarctic ablation and accumulation rates and to provide correction factors for the carbon 14 ages of ice samples dated using trapped carbon 14. Recent studies have established the presence of cosmogenic in-situ produced carbon 14 in polar ice. In conjunction with estimated carbon 14 production rates, measured concentrations of carbon 14 per gram of ice yield, ablation rates which are in good agreement with the values determined from stake measurements. Similar studies to determine accumulation rates have been tested and the estimates are consistent with previous studies. This study will expand the preliminary work done to date in order to improve the 14CO and 14CO2 vacuum extraction techniques, by lowering blank levels and by obtaining more complete separation of 14CO and 14CO2.