Proficiency test of gamma spectrometry laboratories in Serbia.

This paper presents the statistical evaluation of results from the analysis of 8 radionuclides in water samples within the frame of the First Proficiency Test of gamma spectrometry Laboratories in Serbia organized in 2008. The water samples used in this proficiency test were prepared using certified radioactive solution containing gamma emitting radionuclides. This solution was diluted and used as a master solution for preparation of test samples. The overall performance evaluation showed that 64.7% of all reported results met the individual proficiency test criteria, where 26.5% of all reported results did not pass the overall PT acceptance criterion.