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.
This is a preview of subscription content, log in to check access.
Buy single article
Instant access to the full article PDF.
Price includes VAT for USA
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 169:125–158
De Corte F (2001) The standardization of standardless NAA. J Radioanal Nucl Chem 248:13–20
Westcott CH (1960) Effective cross section values for well-moderated thermal reactor spectra, AECL-1101, 3rd edn. Chalk River Laboratory, Chalk River
Holden NE (1999) Temperature dependence of the Westcott g-factor for neutron reactions in activation analysis. Pure Appl Chem 71:2309–2315
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 179:93–103
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 85:47–67
De Corte F (1987) The k0-standardization method: move to the optimization of neutron activation analysis. Habil. Thesis, Ghent University, Gent
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 271:283–287
About this article
Cite this article
van Sluijs, R., Jacimovic, R. & Kennedy, G. A simplified method to replace the Westcott formalism in k 0-NAA using non-1/v nuclides. J Radioanal Nucl Chem 300, 539–545 (2014). https://doi.org/10.1007/s10967-014-2958-8
- k 0-NAA
- k 0-Method
- Non 1/v