鄂尔多斯盆地地下水中氚的演化及其年龄

The age and origin of groundwater in the Ordos basin

通过总结20世纪60年代以后不同时期大气降雨氚的组成,根据衰变定律,描述了氚在不同时期形成的地下水中的演化轨迹;通过比较不同时期大气降雨氚的组成和所形成的地下水中氚的演化,得出地下水中氚的衰减速度比大气降雨中氚的更新速度慢这一结论;根据鄂尔多斯盆地地下水中氚的组成,解释了鄂尔多斯盆地地下水的形成年龄。

Summarizing the compositions of tritium in precipitation since the 1960's,and based on the decay law of isotope, the tracks of tritium evolution in groundwater formed in different terms was described. Comparing the composition of tritium of precipitation in different terms with the evolution of tritium in groundwater formed from precipitation, the authors get conclusion that the rate of decay of tritium in groundwater is slower than that of renew of the tritium in precipitation, and explain the age and origin of the groundwater in the odos basin, according to the composition of tritium in groundwater in the Ordos basin.