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Abstract: The electronic radon monitors are noted for their convenience and acceptable accuracy. Even so, it is necessary to reassure their data quality regularly. We utilized a performance comparison system for this purpose. The instruments in our laboratories (Alphaguard, RAD7, RTM-2100 and Safety Siren) were tested via the comparison experiments. We conclude that by utilizing this system with the concept of calibration factor, it can be helpful to decide whether to send the monitors back to the original manufacturers for adjustment. [Copyright &y& Elsevier]

Abstract: A procedure using liquid scintillation counting for the monitoring of gross alpha and beta activities in environmental water was implemented to improve the conventional procedure using GFPC adopted in Taiwan. The new procedure was acquired through calibration and validation, and then was applied to the monitoring of surface water in Taiwan. This procedure can improve 2–4 times of detection efficiencies and takes only 70–80% of analysis time with reliable accuracy. With these features, the newly developed procedure is favorable during emergency situations. [Copyright &y& Elsevier]

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]