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  • 1 Gent University Laboratory of Analytical Chemistry, Institute for Nuclear Sciences (INW) Proeftuinstraat 86 B-9000 Gent Belgium
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This review describes how the original `standardless' (absolute and single-comparator) NAA-calibration methods, introduced in the mid-1960s, were stepwise upgraded with respect to their accuracy and manageability, leading to the launching of the k 0-method in the mid 1970s. Next, an account is given of the achievements in the continuous development of the k 0-standardization of NAA up to the present. Topics highlighted are:the k 0 -data library, the development of dedicated calibration procedures, extensions and limitations, computerization and quality control/assurance. Finally, a short outline is given of the international dissemination of the k 0-methodology.