A small-angle X-ray scattering (SAXS) study has been carried out to show the changes that occur in the macromolecular structure of poly(gamma-benzyl-L-glutamate) (PBLG) with degree of polymerization 1460, when it is subjected to different doses Of gamma-radiation. It has been observed that the SAXS profiles of various samples undergo drastic changes with increase in dose and their tail regions show a deviation from Porod’s law, which indicates that they are non-ideal two-phase structures, characterized by continuous variation of electron density at the phase boundary. The three- and one-dimensional correlation functions have been computed from the background-corrected SAXS profiles, and various macromolecular parameters have been evaluated following the theories of Vonk and Ruland for non-ideal two-phase structures.