Characterization of CVD Diamond Detector for Neutron Sensor in Harsh Radiation Environments

摘要

The transient signals of 140 μm-thick and 25 um-thick CVD diamond detectors coated by a 95% enriched~6LiF neutron converter were measured for a particles, y-rays and thermal neutrons using a fast current-sensitive preamplifier with 2 GHz bandwidth and 40 dB gain. The pulse height distribution show broader energy resolutions compared to those analyzed in the traditional analog circuit system, these energy resolutions are, however, still sufficient to determine an appropriate threshold to discriminate γ-ray events from neutron events. The 25 μm-thick detector with less γ-ray sensitivity can be a promising candidate for neutron measurement under harsh γ-ray environments. By using a more effective digital filtering and signal analysis one may be able to reduce the electric noise and improve the energy resolution.