Digital Coincidence System for beta-gamma Coincidence Counting

Abstract The 4 π β − γ coincidence efficiency extrapolation method is the most popular for the absolute determination of radioactivity and has been successfully applied to a number of radionuclides. It requires highly experienced technicians and niggling operation to perform the radioactivity measurement via the classical analog coincidence counting (ACC) system. The digital coincidence counting (DCC) can provide the more easy and flexible data acquirement process than ACC. This brief paper present the development and validation of a new DCC system that was realized in 2004. To compare with other DCC systems, the advantages of our DCC system included high throughput rate of pulse and adapt to pulse width from 50ns to hundreds ms.