Proficiency test for clearance mixed-nuclide samples

In 2010, the National Radiation Standard Laboratory held a proficiency test for measurement and analysis of clearance mixed-nuclide samples. Two types of samples, box-shape and drum-shape, containing 60Co and 137Cs mixed solutions were measured by the participating laboratories and their results were then compared with the reference values. Seven participants used plastic scintillator counting systems and two participants used HPGe spectrometer systems to join in this study, obtaining 40 measurement results. The evaluation results showed that all the participants passed the requirements of this proficiency test, En≦1, and the discrepancy was between −25% and 50%.

► Proficiency test for measurement and analysis of clearance mixed-nuclide samples.
► Box-shaped and drum-shaped samples containing 60Co and 137Cs mixed solution were measured.
► Seven used plastic scintillator systems and two used HPGe spectrometer systems.
► Totally 40 measurement results were obtained.
► Proficiency test criteria: En≦1 and the discrepancy between −25% and 50%.