Three-terminal regulators used in electronic system were irradiated by 60Co γ-rays to investigate their total-dose effects.The results show that the output voltage and the maximum load current of the regulators were quite sensitive to the total dose.The output voltage of adjustable regulators changed more sharply than that of fixed.For circuits operating under the radiation environment
the fixed voltage regulator is better than adjustable regulators.Meanwhile
the maximum load current should be considered to satisfy the need of the circuits system with the reduction after irradiated.