Digital coincidence counting with 4(PPC)- for the standardization of ⁶⁰Co

A 4 pi beta(PPC)-gamma coincidence system has been made at KRISS based on a digital DAQ. Co-60 sources were measured to verify the system. The maximum detection efficiency for beta particles was estimated to be 96.7 %. Massic activities for sample sources had 0.005 % of the sample variability error, which was well within the expanded standard uncertainty of 0.54 % (k = 2).