The effects of lambda -ray irradiation on GaAs MESFETs were studied. The la
mbda -ray irradiation was generated from a Co-60 source. DC characteristics
of the MESFETs were used to monitor the effects of radiation, which includ
ed source-drain I-V characteristics, gate leakage current, saturation drain
current, sub-threshold gate leakage current, and sheet resistance. These c
hanges of device characteristics provided us a useful method to determine t
he radiation damage coefficient. (C) 2001 Elsevier Science Ltd. All rights
reserved.