Atom-trap trace analysis of 41 Ca/Ca down to the 10 –17 level

The cosmogenic isotope 41 Ca with a half-life of 99,000 years can, in principle, serve as a tracer for environmental processes at an age scale beyond the reach of 14 C. With accelerator mass spectrometry, the ratio of 41 Ca/Ca has been measured down to the 10 −15 level in natural samples. A wide range of potential applications, such as the burial dating of bones and exposure dating of rocks, require measuring even smaller 41 Ca/Ca ratios in the range of 10 −16 to 10 −15 . Here we achieved this by employing the atom-trap trace analysis method in which individual 41 Ca atoms are selectively captured in a magneto-optical trap and counted by detecting their fluorescence. We realized a precision of 12% on the 41 Ca/Ca ratio at the level of 10 −16 and achieved a detection limit at the level of 10 −17 , which is below the distribution of natural abundances. We verified the accuracy of the 41 Ca/Ca results through a series of measurements of reference samples, and performed demonstration analyses on bone, rock and seawater samples. Our table-top method has the potential to explore the suitability of 41 Ca as a tracer.