Single crystals of Bi2Sr2CaCu2O8+x(Bi-2212) with T-c of 80 K have been
subjected to irradiation with 40 MeV a-particles from a Variable Ener
gy Cyclotron at various doses up to 2x10(15) alpha particles/cm(2). T-
c decreases after irradiation. From the analysis of excess conductivit
y, it has been found that the interlayer coupling strength J decreases
with the increase of irradiation dose. This decrease is due to a decr
ease in oxygen concentration.