Ar-39 Detection at the Part-per-quadrillion Levelwith Atom Trap Trace Analysis – Niels Bohr Institute - University of Copenhagen

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Niels Bohr Institute > Calendar > 2011 > Talk by Dr. Zheng-Tian...

Ar-39 Detection at the Part-per-quadrillion Levelwith Atom Trap Trace Analysis

Talk by Zheng-Tian Lu
Physics Division, Argonne National Laboratory
The Department of Physics and Enrico Fermi Institute, The University of Chicago
Email: lu@anl.gov  Homepage: http://www.phy.anl.gov/mep/atta/ 

Abstract:
 
Atom Trap Trace Analysis (ATTA), a laser-based atom counting method, has been used to analyze atmospheric 39Ar (half-life = 269 yr), a cosmogenic isotope with an isotopic abundance of 0.8 parts-per-quadrillion (810-16). In addition to the superior selectivity demonstrated in this work, both the counting rate and counting efficiency of ATTA have been improved by two orders of magnitude over prior results. Along with the previously demonstrated detection of 81Kr (229,000 yr) and 85Kr (10.8 yr) at the 10-12 level, ATTA can now be used to analyze all three long-lived noble gas radioisotopes covering a wide range of ages and applications.