It is possible to volatilize about 95% (at temperatures between 200°C and 600°C) of the iodine, which has been produced by
irradiating solid UCl4 with thermal neutrons. The delay times for iodine are decreasing from 2 hrs (at 200°C) to 7 sec (at 600°C). The release of
the iodine is improved by using an inert carrier gas. When adding AgCl to the UCl4 before irradiation is carried out, the release of iodine is suppressed at temperatures lower than 400°C. The adding of KI
leads to a more rapid release of iodine at low temperatures.