High-T c superconductor YBa2Cu3O7-y was irradiated by γ-rays and 14 MeV neutrons to a dose up to 2.5×109 rad and 2×1015 n/cm2, respectively. No significant effects on the critical temperature were found in these irradiations, but the resistivity at 273 K changed slightly. It was concluded from this experiment that electronic process was not very influential in changing the T c and the effects of 14 MeV neutrons on defect formation were assumed to be comparable to those of inpile neutrons.

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