Academy of Sciences of the Czech Republic Nuclear Physics Institute Nuclear Physics Institute CZ-250 68 Řež near Prague Czech Republic
European Commission Joint Research Centre, Institute for Reference Materials and Measurements (IRMM), Institute for Reference Materials and Measurements Retieseweg B-2440 Geel Belgium
Gent University, Institut voor Nucleaire Wetenschappen Laboratory of Analytical Chemistry, Institute of Nuclear Science (INW) Proeftuinstraat 86 B-9000 Gent Belgium
EC-European Commission, JRC-Joint Research Centre Retieseweg European Commission, Joint Research Centre, Institute for Reference Materials and Measurements (IRMM), Technical Responslibe Neutron Activation Analysis B-2440 Geel Belgium
Radiation stability of a set of three synthetic multielement standards (SMELS) designed for validation of k0-standardization in neutron activation analysis was tested by monitoring mass and element content changes following irradiation at a high neutron fluence rate (up to 9.1013 n.cm-2.s-1) for stepwise increased periods of time. No mass changes were detected and for all the 26 elements investigated only a chlorine content loss was observed. Thus, radiation stability of the SMELS materials for the given purpose and their suitability for use also in high-power reactors was demonstrated.