The authors studied the influence of solution depth on the amount of hydrogen released from non-stirred aqueous nitric acid solution with a laboratory-scale 60</sup>Co<sub> γ-ray irradiation apparatus. In the experiment, dose rate was 1.3-6.3kGy/h, nitric acid concentration 1-5M, temperature 10-60°C, and solution depth 5-105cm.
The number of molecules of hydrogen released per energy absorption of 100eV, G(H
2)', decreased with an increase in the solution depth; 0.036(5cm depth), 0.012(25cm), 0.0075(45cm) and 0.0059(65cm) for the case of a dose rate 1.8kGy/h, nitric acid concentration 2.5M, temperature 30°C. The concentration of hydrogen dissolved in irradiated solution measured immediately after completing irradiation increased through a maximum at approximately 20 cm depth, and then decreased with an increase in the solution depth. Moreover, G(H
2)' in case of same solution depth, increased both with a decrease in the dose rate, and with an increase in the solution temperature.
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