The effect of gamma irradiation on the dislocation relaxation peak, i.e. the Bordoni peak, of high purity polycrystalline gold has been studied at frequency of 10MHz. It was found that the effect of gamma radiation is more significant in specimen irradiation at room temperature (1A) than that irradiated at liquid nitrogen temperature. The variation of the peak height, and temperature of the dislocation relaxation peak as a function of gamma doses are explained in terms of the Kink-Pair formation model.