Solid samples of hydrated and anhydrous oxalic acid were irradiated with doses of 1-200 Mrad of gamma radiation. The $G({\rm CO}_{2})$ values, 7.4 and 4.7, respectively, for ${\rm H}_{2}{\rm C}_{2}{\rm O}_{4}$ and ${\rm H}_{2}{\rm C}_{2}{\rm O}_{4}\cdot 2{\rm H}_{2}{\rm O}$ were determined via gas chromatography after acid dissolution of the samples. Carbon dioxide and water were determined to be the major decomposition products of radiolysis. The $G({\rm CO}_{2})$ value for ${\rm Li}_{2}{\rm C}_{2}{\rm O}_{4}$ is 0.16, for ${\rm Na}_{2}{\rm C}_{2}{\rm O}_{4}$ it is 0.06, and for ${\rm K}_{2}{\rm C}_{2}{\rm O}_{4}\cdot {\rm H}_{2}{\rm O}$ it is 0.82. In each case only a slight deviation from linearity is noted in the dose-dependent curves.