Abstract
An approximation method using to estimate the influence of the uncertainties of the neutron flux characteristic parameters in the irradiation positions on the NAA results using k0-standardization technique was presented. Those are the epithermal reactor neutron spectrum shape-factor α, the effective resonace energy Ε for a given nuclide and the thermal to epithermal neutron flux ratio f. The method is applied to estimate the effect of the uncertainties in the determination of α Ε, and f on final NAA results for some irradiation channels of the Dalat reactor. It also shows that presented method is suitable in practical use for the estimation of the errors due to the uncertainty of the neutron flux characteristic parameters at the irradiation position.
Highlights
Since the k0-standardization method was introduced in NAA [1], it has been broadly applied in the reactor in the world
An approximation method using to estimate the influence of the uncertainties of the neutron flux characteristic parameters in the irradiation positions on the NAA results using k0-standardization technique was presented
The method is applied to estimate the effect of the uncertainties in the determination of α, Er and f on final NAA results for some irradiation channels of the Dalat reactor. It shows that presented method is suitable in practical use for the estimation of the errors due to the uncertainty of the neutron flux characteristic parameters at the irradiation position
Summary
Since the k0-standardization method was introduced in NAA [1], it has been broadly applied in the reactor in the world. The k0-factors to Au for interested isotopes in NAA were experimentally determined and tabulated in report [4] with an accuracy which better than 2% (average ~1%). The detector’s efficiency (εp) can be determined with an uncertainty about 2%; but the uncertainty of α can be more than 10%, even bigger, depend on the irradiation channels in reactor. The accuracy and the applicability of the k0-standardization method were detailly presented in paper [5]. We carry out an approximation method to evaluate the effect of errors of α and Eri on the NAA results in the k0-standardization method. The obtained results showed that the approximate method in this work is acceptable with confident accuracy
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