Krypton 81: A New Method of Paleogroundwater Dating

Recently, because of 81Kr’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 105-106 year). This paper summarizes the principles of 81Kr in groundwater dating and extraction method, presents the application of 81Kr 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 81Kr and the researches of old groundwater dating