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The half-life of 225Ac was determined from long-term measurements using an ionization chamber (IC) and a TDCR system. The combined result was found to be 9.9179(3 d, which is in agreement with the outcome from Pommé et al. (2012). For evaluating the counting efficiency of a portal monitor, we use a137Cs radiation point source (1 μCi) to subsequently establish it effective measurable area. Through simulation, we estimate the appropriate distance from potentially contaminated individuals in the scanning queue to the monitoring individua