title: On the long-term stability of calibration standards in different matrices.
abstract: In order to assure Quality Control in accordance with ISO/IEC 17025, it was important, from metrological point of view, to examine the long-term stability of calibration standards previously prepared. Comprehensive reconsideration on efficiency curves with respect to the ageing of calibration standards is presented in this paper. The calibration standards were re-used after a period of 5 years and analysis of the results showed discrepancies in efficiency values.
authors.affiliation: Institute of Nuclear Sciences Vinča, University of Belgrade, POB 522, 11000 Belgrade, Serbia. akandic@vinca.rs
authors.forename: A
authors.initials: A
authors.lastname: Kandić
authors.forename: I
authors.initials: I
authors.lastname: Vukanac
authors.forename: M
authors.initials: M
authors.lastname: Djurašević
authors.forename: D
authors.initials: D
authors.lastname: Novković
authors.forename: B
authors.initials: B
authors.lastname: Šešlak
authors.forename: Z
authors.initials: Z
authors.lastname: Milošević
mesh_terms: D002138:Calibration / Q000592:standards*; D038622:Internationality; D008137:Longitudinal Studies; D011829:Radiation Dosage; D011868:Radioisotopes / Q000032:analysis* / Q000737:chemistry*; D011874:Radiometry / Q000592:standards*; D012015:Reference Standards; D012016:Reference Values
chemical_list: D011868:Radioisotopes