The application and development of k{sub}0-standardization method of neutron activation analysis at Dalat research reactor

摘要

In recent years the k{sub}0-NAA method has been applied and developed at the 500 kW Dalat research reactor, which includes (1) the establishment of a PC database of k{sub}0-NAA-related nuclear parameters, e.g., radionuclide produced, half-lives, k{sub}0-factors, Q{sub}0, (E{top}-){sub}n, E{sub}γ etc; the access to the database is able by a k{sub}0-NAA software or by manual; (2) the detection efficiency calibration of gamma spectrometers used in k{sub}0-NAA, (3) the determination of reactor neutron spectrum parameters such as α and f factors and neutron fluxes in the irradiation channels, and (4) the validation of the developed k{sub}0-NAA procedure by analyzing some SRMs, namely Coal Fly Ash (NIST-1633b), Bovine Liver (NIST-1577b) and IAEA-Soil7. The analytical results showed the deviations between experimental and certified values were mostly less than 15% with most Z-scores lower than 2. The k{sub}0-NAA procedure established at the Dalat research reactor has been regarded as a reliable standardization method of NAA and as available for practical applications, in particularly for airborne particulate and crude oil samples.