The superconducting material with nominal composition Bi1.6Pb0.4Sr2Ca2Cu3Ox has been subjected to irradiation with 500 KeV argon ions at two doses 1 x 10(17) and 2 x 10(17) ions/cm(2). X-ray diffraction, resistivity and magnetic susceptibility examined before and after irradiation. T-c decreased after irradiation. This decrease could be explained to displacement of Bi-Pb.