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Journal of Radioanalytical and Nuclear Chemistry
Authors: A. Simonits, F. De Corte, S. Van Lierde, S. Pommé, P. Robouch, and M. Eguskiza

Abstract  

The k 0 and Q 0 values for 94Zr(n,)95Zr(E = 724.2+756.7 keV) and 96Zr(n,)97Zr( ) 97mNb (E = 743.4 keV) were re-investigated. The aim was to further improve the reliability of the neutron spectrum characterization (f and monitoring) in k 0-NAA, based on "bare monitor" methods with the use of these Zr radionuclides. So as to achieve this goal, experimental determinations were performed in three reactor centers: KFKI AEKI, Budapest (WWR-M reactor); INW, Gent (THETIS reactor); SCK·CEN, Mol (BR1 reactor). The results were: Q 0(94Zr) = 5.306; Q 0(96Zr) = 251.6; k 0(95Zr, 724.2+756.7 keV) = 2.000E-4; k 0(97Zr/97mNb, 743.4 keV) = 1.237E-5. This means that the newly evaluated k 0-values are about 4.7% lower than the formerly reported ones. It is also emphasized that the 97Zr half-life is 16.74 hours, contrary to the 1% higher values usually reported.

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Abstract  

A simple and accurate method is presented to evaluate the burnup effects involved in the neutron activation of 197Au prior to any neutron flux characterisation, based on the spectrometry of the 198Au and 199Au decay gammas. The obtained burnup factor can be used as input for reactor neutron field characterisation techniques using 197Au(n,)198Au as a monitor. This way an iterative procedure is avoided.

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