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Title: Validation of reference materials for uranium radiochronometry in the frame of nuclear forensic investigations

The results of a joint effort by expert nuclear forensic laboratories in the area of age dating of uranium, i.e. the elapsed time since the last chemical purification of the material are presented and discussed. Completely separated uranium materials of known production date were distributed among the laboratories, and the samples were dated according to routine laboratory procedures by the measurement of the ²²⁰Th/²³⁴U ratio. The measurement results were in good agreement with the known production date showing that the concept for preparing uranium age dating reference material based on complete separation is valid. Detailed knowledge of the laboratory procedures used for uranium age dating allows the identification of possible improvements in the current protocols and the development of improved practice in the future. The availability of age dating reference materials as well as the evolvement of the age dating best-practice protocol will increase the relevance and applicability of age dating as part of the tool-kit available for nuclear forensic investigations.
Authors:
 [1] ;  [1] ;  [2] ;  [3] ;  [4] ;  [2] ;  [4] ;  [3] ;  [2] ;  [2] ;  [2] ;  [2] ;  [4]
  1. Institute for Transuranium Elements (ITU), Karlsruhe (Germany). European Commision, Joint Reseach Centre (JRC).
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. CEA, DAM, DIF, Arpajon (France)
  4. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Report Number(s):
LA-UR-14-28168; LLNL-JRNL-701138
Journal ID: ISSN 0969-8043; PII: S0969804315300245
Grant/Contract Number:
AC52-06NA25396; AC52-07NA27344
Type:
Published Article
Journal Name:
Applied Radiation and Isotopes
Additional Journal Information:
Journal Volume: 102; Journal Issue: C; Journal ID: ISSN 0969-8043
Publisher:
Elsevier
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
98 NUCLEAR DISARMAMENT, SAFEGUARDS, AND PHYSICAL PROTECTION; nuclear forensics; age determination; Uranium; Thorium; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; radiochronometry; uranium; thorium; 11 NUCLEAR FUEL CYCLE AND RUEL MATERIALS; 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY
OSTI Identifier:
1250916
Alternate Identifier(s):
OSTI ID: 1201509; OSTI ID: 1227883; OSTI ID: 1313551