Gamma spectrum analysis of IAEA international intercomparison samples

In 2006, the international intercomparision of gamma-radionuclides was conducted by ultra-low background HPGe γ-spectrometer systems in our lab. According to IAEA's rules, activities of 54Mn, 60Co, 65Zn, 134Cs, 137Cs, 241Am, 109Cd, and 210Pb in soil and water, and 40K, 137Cs in grass have to be measured. The activies of these radionuclides were performed by Genie 2000 for γ-spectra analysis and by LabSOCS for efficiency calibration. Our laboratory obtained excellent scores with 89% for acceptable and 0 for not acceptable. The percentage of acceptable is obviously higher than average value 64% in all the participant labs, while those of not acceptable are lower than average 29%. (authors)