The rates of hydrogen release from simulated high-level liquid waste (SHLLW) during irradiation of 60Co γ-rays have been studied using a laboratory-scale apparatus. The SHLLW used was made up of 28 different metal elements, the concentrations of which were determined from a computed data (ORIGEN-2) for a Purex spent fuel (burn-up of 4.5GWd/t, cooling time of 4 years) except for those of corrosion products (Fe, Cr and Ni) and of chemical process additive (P). The nitrate ion concentration of the

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... SHLLW was 4.97M. The G-value of hydrogen release was 0.0164 for stirred conditions, but for nonstirred conditions with dose rate: 2.8kGy/h and with the SHLLW solution height more than 8cm, the following relation was found between the G-value and the solution height (dcm); G(H2)=0.100d-1.6 The G-values of oxygen and nitrogen releases were also determined.