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Title: Setting a limit on anthropogenic sources of atmospheric 81Kr through Atom Trap Trace Analysis

In this study, we place a 2.5% limit on the anthropogenic contribution to the modern abundance of 81Kr/Kr in the atmosphere at the 90% confidence level. Due to its simple production and transport in the terrestrial environment, 81Kr (half-life = 230,000 years) is an ideal tracer for old water and ice with mean residence times in the range of 105–106 years. In recent years, 81Kr-dating has been made available to the earth science community thanks to the development of Atom Trap Trace Analysis (ATTA), a laser-based atom counting technique. Further upgrades and improvements to the ATTA technique now allow us to demonstrate 81Kr/Kr measurements with relative uncertainties of 1% and place this new limit on anthropogenic 81Kr. As a result of this limit, we have removed a potential systematic constraint for 81Kr-dating.
Authors:
 [1] ;  [2] ;  [3] ;  [2] ;  [2] ;  [2] ;  [4]
  1. Argonne National Lab. (ANL), Argonne, IL (United States). Physics Division; Univ. of Chicago, IL (United States). Department of Physics and Enrico Fermi Institute
  2. Argonne National Lab. (ANL), Argonne, IL (United States). Physics Division
  3. University of Science and Technology of China, Hefei (China). School of Nuclear Science and Engineerin
  4. University of Bern (Switzerland). Climate and Environmental Physics Division, Physics Institute
Publication Date:
Grant/Contract Number:
AC02-06CH11357; DEAC02-06CH11357
Type:
Accepted Manuscript
Journal Name:
Chemical Geology
Additional Journal Information:
Journal Volume: 453; Journal Issue: C; Journal ID: ISSN 0009-2541
Publisher:
Elsevier
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 81 Kr; Groundwater dating; Anthropogenic effects; Radioisotope tracers; Noble gas tracers; Atom Trap Trace Analysis
OSTI Identifier:
1356576
Alternate Identifier(s):
OSTI ID: 1413359