Physical Review Letters
Atom trap trace analysis, a laser-based atom counting method, has been applied to analyze atmospheric Ar39 (half-life=269yr), a cosmogenic isotope with an isotopic abundance of 8×10-16. In addition to the superior selectivity demonstrated in this work, the counting rate and efficiency of atom trap trace analysis have been improved by 2 orders of magnitude over prior results. The significant applications of this new analytical capability lie in radioisotope dating of ice and water samples and in the development of dark matter detectors. © 2011 American Physical Society.
© 2011 American Physical Society
Jiang, W.; Williams, William; Bailey, K.; Davis, A. M.; Hu, S. M.; Lu, Z. T.; O'Connor, T. P.; Purtschert, R.; Sturchio, N. C.; Sun, Y. R.; and Mueller, P., "Ar39 Detection at the 10-16 Isotopic Abundance Level with Atom Trap Trace Analysis" (2011). Physics: Faculty Publications, Smith College, Northampton, MA.