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Recently, because of 81 Kr's advantages of steady chemical property, long half-life and no extra source in the movement of groundwater, it is becoming an effective method to date old groundwater (age from 10 5-10 6 year). This paper summarizes the principles of 81 Kr in groundwater dating and extraction method, presents the application of 81 Kr in groundwater dating and discusses the problems of recent related researches, makes prospects of studies of radionuclide in hydrogeology chemistry, and provide scientific support for the measurement of 81 Kr and the researches of old groundwater dating.

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