[en] The characteristics of defects created by irradiation are central to radiation damage theory and to applications such as void growth. Those characteristics which are most important for application purposes are the ''kinetic parameters''--diffusion coefficients, interaction radii, etc. A detailed examination of the kinetic parameters of interstitials in pure copper and in copper alloyed with minor concentrations (approximately 10^-3) of gold or silver is reported. The numerical results of this examination are these kinetic parameters, as well as a picture of the nature of the interactions between defects which is particularly well established by the demanding criteria of detailed kinetic spectroscopy. As examples, trapping by gold (or silver) singlets and gold doublets are differentiated; and the two-stage nature of gold singlets is explained. This spectroscopy has been placed on an evaluated, firm physical foundation by an analysis of uncertainty in a ''parameter space.''