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We place a 2.5% limit on the anthropogenic contribution to the modernabundance of 81Kr/Kr in the atmosphere at the 90% confidence level. Due to itssimple production and transport in the terrestrial environment, 81Kr (halflife= 230,000 yr) is an ideal tracer for old water and ice with mean residencetimes in the range of 10^5-10^6 years. In recent years, 81Kr-dating has beenmade available to the earth science community thanks to the development of AtomTrap Trace Analysis (ATTA), a laser-based atom counting technique. Furtherupgrades and improvements to the ATTA technique now allow us to demonstrate81Kr/Kr measurements with relative uncertainties of 1% and place this new limiton anthropogenic 81Kr. As a result of this limit, we have removed a potentialsystematic constraint for 81Kr-dating.

Setting a Limit on Anthropogenic Sources of Atmospheric 81Kr through Atom Trap Trace Analysis