Authors:A. Simonits, F. De Corte, T. Nimr, L. Moens, and J. Hoste
The present paper deals with the experimental determination and the critical evaluation of Qo, the ratio of the resonance integral (Io) to the 2200 m.s–1 cross-section (
o) for 57 analytically interesting (n, ) reactions, including a revision and updating of formerly published results for 13 isotopes. Full account is given for deviations from the ideal epithermal neutron flux distribution. The Budapest-Gent cooperative determinations, yielding parallel but independent results, lead to recommended Qo-values with an average uncertainty as low as 3%. Finally, with the aid of independently evaluated or measured
o-data, a list of recommended Io-values is given.
Authors:T. El Nimr, F. De Corte, L. Moens, A. Simonits, and J. Hoste
The applicability of the k0 standardization concept in ENAA has been investigated by comparing for 32 isotopes the experimentally determined ke, 0-values with those calculated from well-known k0 and Q0=l0/σ0 factors. It is concluded that the k−-comparator method can be extended and applied in general to epicadmium (n, γ) activation analysis. Attention is also paid
to some specific problems, such as the deviation from the ideal epithermal neutron flux distribution, the uncertainty in the
effective Cd cut-off energy for the Cd-covers used, and the cadmium epithermal neutron transmission factor for which a literature
survey is presented.