title: An analysis of the causes of discrepant results in proficiency tests in a testing laboratory.
abstract: We present an analysis of the results reported in the framework of proficiency tests performed in the years 2003-2007 in a gamma-ray spectrometry laboratory. Measurements of 102 samples and 622 results reporting the activities or activity concentrations of 39 gamma- or X-ray emitters are included in the study. A total of 61 results were found to be in disagreement with their target values. The cause of the disagreement was not found for only 21 discrepant results.
authors.affiliation: Jozef Stefan Institute, Jamova cesta 39, Ljubljana, Slovenia.
authors.forename: Denis
authors.initials: D
authors.lastname: Glavic-Cindro
authors.forename: Matjaz
authors.initials: M
authors.lastname: Korun
mesh_terms: D000199:Actins; D005720:Gamma Rays; D007753:Laboratories / Q000592:standards*; D051304:Profilins; D015203:Reproducibility of Results; D017524:Slovenia; D013051:Spectrometry, Gamma / Q000592:standards*; D014965:X-Rays
chemical_list: D000199:Actins; D051304:Profilins; C024782:profilactin