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Title: Atom Trap, Krypton-81, and Saharan Water

Since radiocarbon dating was first demonstrated in 1949, the field of trace analyses of long-lived cosmogenic isotopes has seen steady growth in both analytical methods and applicable isotopes. The immore »pact of such analyses has reached a wide range of scientific and technological areas. A new method, named Atom Trap Trace Analysis (ATTA), was developed by our group and used to analyze {sup 81}Kr (t{sub 1/2} = 2.3 x 10{sup 5} years, isotopic abundance {approx} 1 x 10{sup -12}) in environmental samples. In this method, individual {sup 81}Kr atoms are selectively captured and detected with a laser-based atom trap. {sup 81}Kr is produced by cosmic rays in the upper atmosphere. It is the ideal tracer for dating ice and groundwater in the age range of 10{sup 4}-10{sup 6} years. As the first real-world application of ATTA, we have determined the mean residence time of the old groundwater in the Nubian Aquifer located underneath the Sahara Desert. Moreover, this method of capturing and probing atoms of rare isotopes is also applied to experiments that study exotic nuclear structure and test fundamental symmetries.« less
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Title: Atom Trap, Krypton-81, and Saharan Water
Authors:
Publication Date: 2005-08-24
OSTI Identifier: 1016873
DOE Contract Number: AC02-07CH11359
Other Number(s): TRN: US1201205
Resource Type: Multimedia
Resource Relation: Conference: Fermilab Colloquia, Fermi National Accelerator Laboratory (FNAL), Batvia, Illinois (United States), presented on August 24, 2005
Research Org: FNAL (Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States))
Sponsoring Org: USDOE Office of Science (SC)
Subject: 54 ENVIRONMENTAL SCIENCES ; 73 NUCLEAR PHYSICS AND RADIATION PHYSICS ; ABUNDANCE ; AGE ESTIMATION ; AQUIFERS ; ATOMS ; CARBON 14 ; ISOTOPE DATING ; KRYPTON 81 ; NUCLEAR STRUCTURE ; WATER
Country of Publication: United States
Language: English
Run Time: 0:51:33
System Entry Date: 2016-01-28