In the nuclear field, molten salts are a growing area of interest to support molten salt reactors as well as pyroprocessing. Monitoring the production of potentially toxic or hazardous gases in these systems is important in preventing the release of such gases into the environment. Iodine is of particular interest, as radioactive I-129 has a long half-life and its toxicity and persistence in the environment make it a great safety concern. Spectroscopic online monitoring tools are well suited to interrogate the harsh environment of molten salt reactors and are ideal for the quantification of iodine in the gas phase due to molecular iodine’s distinct Raman and fluorescence signature. Ultimately, on-line monitoring tools can support a range of work including efficient design of off-gas treatment systems to enabling operator control in deployed systems. Here, we discuss our work pairing Raman and fluorescence spectroscopy with chemometric analysis for the quantification of molecular iodine as a function of pressure and temperature using two laser excitation sources.

Quantification of iodine gas using Raman and fluorescence spectroscopy

ACS Spring Meeting 2021

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