Atom Trap, Krypton-81, and Global Groundwater

Dr. Zheng-Tian Lu (hosted by Ogilvie), Hefei National Laboratory for Physical Sciences at the Microscale Department of Modern Physics, University of Science and Technology of China
February 1, 2017 at 4:00 pm
204 Crow
Event Description 

The long-lived noble-gas isotope 81Kr is the ideal tracer for water and ice with ages of 105 - 106 years, a range beyond the reach of 14C. 81Kr-dating, a concept pursued over the past five decades, is finally available to the earth science community at large. This is made possible by the development of the Atom Trap Trace Analysis (ATTA) method, in which individual atoms of the desired isotope are captured and detected. ATTA possesses superior selectivity, and is thus far used to analyze the environmental radioactive isotopes 81Kr, 85Kr, and 39Ar. These three isotopes have extremely low isotopic abundances in the range of 10-16 to 10-11, and cover a wide range of ages and applications. In collaboration with earth scientists, we are dating groundwater and mapping its flow in major aquifers around the world. We have also demonstrated for the first time 81Kr-dating of old ice.

Coffee: 3:30 pm, 245 Compton