The electronic absorption spectra of dithizone (H2DZ) and its metal complexes of Hg. Cd, and Zn doped in poly(methyl methacrylate), PMMA has been investigated before and after γ-irradiation. It is found that the complex formation resulted in significant changes in both the position and the intensity of the electronic bands of H2DZ. γ-Radiation causes remarkable decrease in the intensity of the most absorption bands of the metal complexes. The rate of decrease depends on the nature of the metal ions.