Journal of Radioanalytical and Nuclear Chemistry

, Volume 307, Issue 3, pp 2459–2463 | Cite as

Quality assurance of temporal variability of natural decay chain and neutron induced background for low-level NORM analysis

  • Michael Yoho
  • Donivan R. Porterfield
  • Sheldon Landsberger


Twenty-one high purity germanium (HPGe) background spectra were collected over 2 years at Los Alamos National Laboratory. A quality assurance methodology was developed to monitor spectral background levels from thermal and fast neutron flux levels and naturally occurring radioactive material decay series radionuclides. 238U decay products above 222Rn demonstrated minimal temporal variability beyond that expected from counting statistics. 238U and 232Th progeny below Rn gas displayed at most twice the expected variability. Further, an analysis of the 139 keV 74Ge(n, γ) and 691 keV 72Ge(n, n′) spectral features demonstrated temporal stability for both thermal and fast neutron fluxes.


NORM Neutron Background Quality assurance HPGe 



This material is based upon work supported by the U.S. Department of Homeland Security under Grant Award Number, 2012-DN-130-NF0001. The views and conclusions contained in this document are those of the authors and should not be interpreted as representing the official policies, either expressed or implied, of the U.S. Department of Homeland Security.


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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2015

Authors and Affiliations

  • Michael Yoho
    • 1
  • Donivan R. Porterfield
    • 2
  • Sheldon Landsberger
    • 1
  1. 1.Nuclear Engineering Teaching Lab, Department of Mechanical Engineering, Nuclear Engineering ProgramThe University of Texas at AustinAustinUSA
  2. 2.Los Alamos National LaboratoryLos AlamosUSA

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