Gas-Phase UV Photolysis of CH3 131I

Abstract

Gas-phase UV photolysis of 131 I-labeled CH 3 I was studied. CH 3 131 I (228 mg) is completely photolyzed within 5 min under the static conditions at room temperature in an argon atmosphere. The final radioiodine compound formed under these conditions is 131 I 2 . The chemical composition of the final products of CH 3 I photolysis in air is more complex. Agglomeration corcystallization of the CH 3 I photolysis products with NH 4 Cl in the gas phase was studied. The results of this study suggest that the main final product of CH 3 I photolysis in air is a fine I x O y aerosol. In the presence of NH 4 Cl, formation of NH 4 131 I aerosols is possible.

A Study of the Thermal Decomposition of CH3131I in a Gas Flow in the Presence of “Fizkhmin”TM Granulated Materials

“…As noted in [10], under the action of UV radiation CH 3 I decomposes to form chemically active atomic iodine. At the same time, we suggested in [11] that decomposition of CH 3 131 I under the action of UV radiation in air yields not only chemically active atomic iodine, but also finely dispersed I x O y aerosols. It is also suggested using for CH 3 I decomposition a method based on the action of ozone in a field of electric charge [12].…”