Author/Authors :
Braunschweig، نويسنده , , W. and Kubicki، نويسنده , , Th. and Lübelsmeyer، نويسنده , , K. and Pandoulas، نويسنده , , D. and Syben، نويسنده , , O. and Tenbusch، نويسنده , , F. and Toporowsky، نويسنده , , M. and Wilms، نويسنده , , Th. and Wittmer، نويسنده , , B. and Xiao، نويسنده , , W.J.، نويسنده ,
Abstract :
Surface barrier particle detectors, processed in Aachen using SI GaAs from several manufacturers, have been irradiated with neutrons (peak energy ∼1 MeV) up to fluences of 4.0 × 1014 n/cm2 and with photons from a 60Co source with a dose of 100 Mrad. All detectors work well after the irradiation. Detectors biased with 200 V during the neutron irradiation show no significant difference from those not biased. After irradiation with 4.0 × 1014 n/cm2 the leakage currents at 200 V are a factor of 4 greater than those before irradiation. At the highest radiation level the signal for minimum ionizing particles corresponds to 7200 electrons (at 200 V bias voltage) independent of peaking times between 40 ns and 2.2 μs. The signals for α-particles (2.2 μs peaking time, 200 V bias voltage) are about 20% of those before irradiation. The exposure to the 100 Mrad photon dose caused little change of the detector performance. The leakage currents were even reduced by about 10%.
