The oxidation rate of U rods by partially decomposed CO
2 was measured thermogravimetrically and compared with that by undecomposed CO
2, in an attempt to study the effect of ionizing radiation on the compatibility of U with CO
2. The decomposition was by silent discharge. Measurement was performed for cases of 0.29%, 0.44% and 0.68% decomposed CO
2, at 500° and 600°C. It was found that the oxidation rate rises almost linearly with increasing percentage of decomposition of the CO
2. At 500°C the oxidation rate with 0.68% decomposed CO
2 was eighteen times higher than with undecomposed CO
2, and five times higher at 600°C. Such increase was related to O
2 content in the decomposed gas.
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