Abstract: A silver-activated detector working in current-mode was designed in order to measure the yield of a DPF pulsed neutron source. The detector was made up of neutron moderating material, natural silvers, plastic scintillators and a photo-multiplier tube. The detection sensitivity to a DPF pulsed neutron source was defined. The detector was calibrated by a high voltage neutron generator. The neutron flux of this constant neutron source was absolutely measured by associated particle method. When the detector was saturated irradiated, output currents were recorded by the computer automatically. By analyzing the varied current curve, typical parameters were deduced. When the silver-activated detector is 1 m far from the 14 MeV pulsed neutron source, the detection sensitivity is about 1.843'10⁹ nA^－1. When coverage factor is 2, the expand measurement uncertainty is less than 17.5 %.