The Brazilian National Intercomparison Program (PNI/IRD/CNEN): evaluation of 15 years of data

Laboratory performance were grouped and evaluated in three periods of 5 years each. The first period shows, an average value of good performance of 71.2%, the second shows an average of 78.6% and the last an average of 82.3%. Performance for each kind of radionuclide is also presented.