AER/I Chemistry Doctoral Final Defense with Chelsie Beck
About the event
Presenter: Chelsie Beck
Group: Sue Clark
Title: CHARACTERIZATION OF THE ADSORBED SPECIES OF MOLECULAR IODINE ON METAL SUBSTRATES
Abstract: Molecular iodine [I2] is one volatile species of iodine that is released in the event of a nuclear accident. The release of radioiodine poses a concern to public health due to potential bioaccumulation of iodine from food and other sources. If radioiodine is present in these sources, it is accumulated with stable iodine in the thyroid and can lead to thyroid cancer or other thyroid disorders. Iodine has one stable isotope with 127 amu. There are two major isotopes of radioiodine: 131I and 129I. 131I has a half-life of 8.04 days and poses the greatest threat to human health due to its high specific activity. 129I has a half-life of 15.7 mil years and consequently becomes a long-term problem for the environment. Other isotopes of radioiodine exist but they have much shorter half-lives. Molecular iodine, I2, is one gaseous species of iodine and the closer to the source of the accident the larger the fraction of gaseous iodine that is expected to be in this form. Molecular iodine will react with most surfaces to physisorb and with metal surfaces it is known to chemisorb. The chemical transformation that occurs upon chemisorption changes the species of iodine and therefore its properties, including the volatility and the chance for resuspension. This work focuses on characterizing the species of adsorbed iodine on metal substrates.
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Date & Time: Mar 26, 2021 03:00 PM Pacific Time (US and Canada)