A simplified method to replace the Westcott formalism in k 0-NAA using non-1/v nuclides

  • R. van SluijsEmail author
  • R. Jacimovic
  • G. Kennedy


The Westcott formalism was developed to accurately describe the activation of nuclides whose neutron capture cross-sections do not follow the 1/v-law and it was incorporated in the k 0-method about 20 years ago. However, its implementation in the original fashion is not easy, requiring the use of a different formalism for the non-1/v nuclides, with a g(T n) factor for the thermal neutron activation and an s 0 factor for epithermal activation, the measurement of the neutron spectral index of the irradiation channel and the irradiation of a temperature monitor with each batch of samples as well. In this work we investigated the accuracy of maintaining the simpler formula of the Høgdahl convention for all nuclides and introducing the g(T n) factor for the thermal neutron activation for non-1/v nuclides. The epithermal activation is calculated using a Q 0-value estimated from the measured s 0-value for non-1/v nuclides. This new approach has been shown, by calculations with the parameters of the neutron spectra of five irradiation channels, not to give a significant loss of accuracy relative to the Westcott formalism.


k0-NAA k0-Method Westcott Høgdahl Non 1/v Kayzero 


  1. 1.
    De Corte F, Simonits A, Bellemans F, Freitas MC, Jovanovic S, Smodis B, Erdtmann G, Petri H, De Wispelaere A (1993) Recent advances in the k 0-standardization of neutron activation analysis: extensions, applications, prospects. J Radioanal Nucl Chem 169:125–158CrossRefGoogle Scholar
  2. 2.
    De Corte F (2001) The standardization of standardless NAA. J Radioanal Nucl Chem 248:13–20CrossRefGoogle Scholar
  3. 3.
    Westcott CH (1960) Effective cross section values for well-moderated thermal reactor spectra, AECL-1101, 3rd edn. Chalk River Laboratory, Chalk RiverGoogle Scholar
  4. 4.
    Holden NE (1999) Temperature dependence of the Westcott g-factor for neutron reactions in activation analysis. Pure Appl Chem 71:2309–2315CrossRefGoogle Scholar
  5. 5.
    De Corte F, Bellemans F, De Neve P, Simonits A (1994) The use of a modified Westcott-formalism in the k 0-standardization of NAA—the state of affairs. J Radioanal Nucl Chem 179:93–103CrossRefGoogle Scholar
  6. 6.
    De Corte F, Simonits A (2003) Recommended nuclear data for use in the k 0 standardization of neutron activation analysis. At Data Nucl Data Tables 85:47–67CrossRefGoogle Scholar
  7. 7.
    De Corte F (1987) The k0-standardization method: move to the optimization of neutron activation analysis. Habil. Thesis, Ghent University, GentGoogle Scholar
  8. 8.
    St-Pierre J, Kennedy G (2007) Corrections for neutron activation analysis with non-1/v nuclides using reactor moderator temperature readings. J Radioanal Nucl Chem 271:283–287CrossRefGoogle Scholar

Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2014

Authors and Affiliations

  1. 1.K0-WareHeerlenThe Netherlands
  2. 2.Department of Environmental SciencesJozef Stefan InstituteLjubljanaSlovenia
  3. 3.Engineering Physics DeparmentEcole PolytechniqueMontrealCanada

Personalised recommendations