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Journal of Radioanalytical and Nuclear Chemistry

, Volume 298, Issue 3, pp 1819–1822 | Cite as

Delayed-neutron activation analysis at NIST

  • Sofia M. Eriksson
  • Elizabeth A. Mackey
  • Richard M. Lindstrom
  • George P. Lamaze
  • Kelly P. Grogan
  • Dennis E. Brady
Article

Abstract

An automated delayed-neutron activation analysis system has been installed at the NIST research reactor. This work involved characterization of the transfer time of the system, evaluation of blanks, and tests of the system’s analytical capabilities through quantitative analysis for uranium in several natural matrix standard reference materials (SRMs). The calibration curve was shown to be linear up to at least 20 μg of uranium, and the well-thermalized reactor irradiation position makes the system insensitive to thorium and oxygen. For SRMs 1646a Estuarine Sediment and 2710a Montana Soil the values determined for this work agree with the reference and certified values, respectively. The mass fraction of uranium in SRM 695 Multi-Nutrient Fertilizer is the first reported for this material. For this system and the irradiation, transfer, and counting times used, the limit of detection for natural uranium is 20 ng, which corresponds to approximately 200 pg of 235U.

Keywords

Activation analysis Delayed neutrons Fissile measurement Nuclear forensics Uranium determination 

Notes

Acknowledgments

We thank Jeffrey Ziegler (NIST) for constructing the neutron detector electronics, Nathan Bickford and John Langland (NIST) for their help in the early stages of this work, and Alice Mignerey (University of Maryland) for additional encouragement and discussions. Identification of commercial products does not constitute endorsement by the authors or their institutions.

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2013

Authors and Affiliations

  • Sofia M. Eriksson
    • 1
    • 2
  • Elizabeth A. Mackey
    • 3
  • Richard M. Lindstrom
    • 3
  • George P. Lamaze
    • 3
  • Kelly P. Grogan
    • 3
  • Dennis E. Brady
    • 4
  1. 1.Department of ChemistryUniversity of MarylandCollege ParkUSA
  2. 2.Swedish Defense Research AgencyUmeåSweden
  3. 3.Chemical Sciences DivisionNational Institute of Standards and TechnologyGaithersburgUSA
  4. 4.NIST Center for Neutron ResearchNational Institute of Standards and TechnologyGaithersburgUSA

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