塔里木盆地东北部大气降水氚浓度的恢复及应用

氚作为一种理想的示踪剂和测年技术手段，在地下水研究中应用广泛。为了解决塔里木盆地东北部地下水氚测年研究中的大气降水氚浓度恢复问题，采用因子分析法，建立了塔里木盆地东北部大气降水氚浓度模型，并用实测数据进行了模型校正，校正后模型计算结果与实测数据吻合良好，表明所建立的大气降水氚浓度模型较合理；同时，考虑到研究区大气中氚含量受20世纪大气层核试验的影响，采纳了前人部分研究成果，最终恢复了该区域1960—2009年大气降水氚浓度值。据此，将所恢复的大气降水氚浓度数据作为输入值，代入到氚测年的活塞流模型和混合流模型，计算了研究区4个地下水样的年龄，并分析了氚年龄计算结果的合理性，认为所获得的年龄数据符合当地水文地质条件，这进一步证明了本文所恢复的大气降水氚浓度值较为可靠。

Recovery and application of tritium concentration in precipitation in northeast of Tarim Basin

As an ideal tracer and radio element for dating, Tritium is broadly applied in hydrogeology. In order to obtain the tritium concentration in precipitation in northwest Tarim basin, a model is developed using factor analysis method and corrected with the measured data. The calculated results of model are in good agreement with the measured data, showing that the model is reasonable. The recovered tritium concentration data in precipitation in the northwestern Tarim basin is put to the piston flow model and the mixed flow model to date four groundwater samples in the study area. It is found that the tritium age results of groundwater are consistent with the hydrogeological conditions of study area, indicating that the model of tritium concentrations in precipitation in the northwestern of Tarim basin is reliable.