Abstract
Radiation hardness of semi-insulating GaAs detectors against 60Co gamma-rays, fast neutrons and 5MeV electrons was compared. Slight improvements in charge collection efficiency (CCE) and energy resolution in FWHM (Full Width at Half Maximum) were observed at low doses with all kinds of radiation followed by their degradation. The effect occurred at a dose of about 10Gy of neutrons (CCE improved by 1%, FWHM by 5% on average), at 1kGy of electrons (FWHM decreased by 3% on average) and at 10kGy of gamma-rays (CCE raised by 5% and FWHM dropped by 8% on average), which is in agreement with the relative displacement damage of the used types of radiation. Gamma-rays of MeV energies are 1000-times less damaging than similar neutrons and electrons about 10-times more damaging than photons. On irradiating the detectors with neutrons and electrons, we observed a global increase in their detection efficiency, which was caused probably by enlargement of the active detector area as a consequence of created radiation defects in the base material. Detectors were still functional after a dose of 1140kGy of ∼1MeV photons, 104kGy of 5MeV electrons but only up to 0.576kGy of fast (∼2 to 30MeV) neutrons.
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