Effects of temperature and solution composition on evaporation of iodine as a part of estimating volatility of iodine under gamma irradiation

摘要

As a part of evaluating the volatility of iodide ions subjected to gamma irradiation, I 2 evaporation experiments were performed with I 2 and I – mixed solutions in the temperature range 26–80°C in an open, well-ventilated space. The evaporation of I 2 was observed to follow primarily first order kinetics, depending on the I 2 concentration. The evaporation rate constant increased rapidly with increase in temperature. The presence of I – slightly reduced the evaporation rate of I 2 by forming relatively stable I 3 ? . The effect of Cl – at <1.0?wt% on I 2 evaporation was insignificant. The evaporation rate constants of I 2 were 1.3?×?10 ?3 min ?1 cm ?2 , 2.4?×?10 ?2 min ?1 cm ?2 , and 8.6?×?10 ?2 min ?1 cm ?2 , at 26°C, 50°C, and 80°C, respectively.