Irradiation effects of proton and gamma -ray on CVD diamond detector

Irradiation effects of proton and gamma-ray on a CVD diamond detector were studied on Beijing Tandem accelerator and 60Co source. The decrease of the detector’s signal current was less than 3.5% after irradiated by 1013 cm-2,9 MeV continuous protons. Dark current didn’t change obviously after the proton irradiation. The calculated radiation damage coefficient is 1.3×1016 μm-1·cm2, which is much higher than that of Si PIN detectors. The signal current increased a little after irradiated by 10.32 C/kg and 1.25 MeV γ-ray, as the electrons excited by γ-ray can deduce traps in diamond. And the increase is less than 0.7%. Diamond detector has high radiation hardness and can be used in high radiation detection.