Characterization of neutron spectrum at Es-Salam Research Reactor using Hogdahl convention and Westcott formalism for the k0-based neutron activation analysis

For the general applicability of the k0-NAA method two formalisms were carried out to deal with '1/v and non-l/v ((n,γ)' reaction nuclides, respectively. In the Hogdahl-formalism the reactor neutron spectrum parameters, such as α and f were measured using three methods: Cd-ratio, Cdcovered and bare triple monitors. In addition, bare bi-isotopic method using Zr is also utilized for the calculation of f. According to the Westcottformalism the modified spectral index x r(α)√Tn/T0 and g(Tn) factor for monitoring neutron temperature Tn, were measured employing Lu as non '1/v' monitor and 197Au, 96Zr and 94Zr as '1/v' monitors. The reduced resonance integral of lutetium s0,Lu was also calculated. To evaluate the applicability of k0-NAA in our analytical system, the analysis of two kinds of SRMs was executed. The analytical results showed that the relative error of most of the elements was less than 10%. (author)