Counting Radio-Krypton Atoms with a Laser
- Received Date: 2015-05-26
Abstract: Because of their unique chemical and physical properties, long-lived rare krypton radioisotopes, 85Kr and 81Kr, are ideal tracers for environmental samples, including air, groundwater and ice. Atom trap trace analysis (ATTA) is a new laser-based method for counting both 85Kr and 81Kr atoms with the abundance as low as 10-14 with micro-liters (STP) krypton gas. The entire system for rare radio-krypton measurement built at Hefei is presented, including the atom trap trace analysis instrument and sampling apparatus of gas extraction from water and krypton purification. Atmospheric85Kr concentrations at different places in China were measured, showing a range of 1.3-1.6 Bq/m3, consistent with the northern hemispheric baseline. As a demonstration of the system, some shallow and deep groundwater samples in north and south China were sampled and dated.
|Citation:||Guo-min Yang, Le-yi Tu, Cun-feng Cheng, Xiang-yang Zhang, Shui-ming Hu. Counting Radio-Krypton Atoms with a Laser[J]. Chinese Journal of Chemical Physics , 2015, 28(4): 445-451. doi: 10.1063/1674-0068/28/cjcp1505108|