Abstract: The electrical transport properties of La0.67 Ca0.33 MnO3 film under γ ray irradiation is studied by using a real-time measurement system based on LabVIEW program. It reveals some interesting phenomena： when the film is irradiated by gamma-ray, its resistance decreases at the begimfing but then increases obviously under the continuously long-time irradiation. For comparison, the influence of 3, ray irradiation on the resistance of 1 wt% Nb doped NSTO is also measured, which shows no distinct change as that in LCMO. A phenomenologieal explanation for the conductive behavior of LCMO films is proposed by taking into account the strongly electronic correlation feature and the irradiation damage mechanism in LCMO.

Key words: LabVIEW program, irradiation damage, perovskite manganite oxides, resistance