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Abstract: The drum counting system was calibrated in this study. For 137Cs, the counting efficiencies were around 14–1% when the density of the waste of the drum was changed from 0.15 to 2.3gcm−3. The effects of the background, hot spot, system linearity, sample density and weighing were also evaluated in this work. The combined standard uncertainty of the drum counting system for the 137Cs in the density of 1g cm−3 was around 12%. To verify the counting system, the drums containing radioactive solution were prepared by the NMI as the blind samples. A discrepancy below 15% was shown between the counting results and the reference values of the NMI. [Copyright &y& Elsevier]

Abstract: Performance tests of a movable gamma-ray waste drum scanning system were carried out in this study. The scanner consists of a single HPGe detector on a movable cart with a 90° collimation angle to the observed item. The detection efficiency for 137Cs was determined using the ISOTOPIC software. The activities of 35 low-level radioactive waste drums were measured using this system and compared with the results of two other measurement systems. This movable scanning system gave the same result as the other two systems with a relative spread (one standard deviation) of about 7.2%. [Copyright &y& Elsevier]