Use of the transpiration method to study polonium evaporation from liquid lead-bismuth eutectic at high temperature
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Borja Gonzalez Prieto
Abstract
Qualitative and quantitative understanding of Po volatilization under different conditions is of key importance for safety assessments of lead-bismuth eutectic (LBE) based nuclear reactors, spallation targets and accelerator driven systems. In this work we explore the possibilities of the transpiration method in combination with simple models to study the equilibrium and kinetics of Po evaporation from highly diluted solutions in lead-bismuth eutectic between 600 and 1000 ℃ in Ar/5% H2 and Ar. On the basis of evaporation experiments at various carrier gas flow rates, we identified the conditions of vapor saturation allowing the determination of equilibrium constants. From the limiting behavior at high flow rates, values for the maximal evaporation rate of Po from LBE were estimated. Measurements of evaporation as a function of time were consistent with the assumption that polonium dissolved in LBE obeys Henry's law. A theoretical analysis furthermore suggested that diffusion of polonium in LBE was not a rate limiting factor for evaporation under vapor saturation conditions. Newly determined values for the Henry constant of Po in LBE between 600 and 1000 ℃ were consistent with previously derived correlations.
©2014 Walter de Gruyter Berlin/Boston
Artikel in diesem Heft
- Frontmatter
- Nature of nano-sized plutonium particles in soils at the Hanford Site
- Studies on electrochemical behaviour on NpO22+/NpO2+ redox couple at single walled carbon nanotube modified glassy carbon electrode (SWCNT-GC)
- Study on the technology of U-Pu Co-stripping process for reprocessing spent fuel of fast reactor
- Use of the transpiration method to study polonium evaporation from liquid lead-bismuth eutectic at high temperature
- In-situ formation, thermal decomposition, and adsorption studies of transition metal carbonyl complexes with short-lived radioisotopes
- Production of 111In and 114mIn by proton induced reactions: an update on excitation functions, chemical separation – purification and recovery of target material
- Preparation and preliminary biological evaluation of radiogallium-labeled DTPA-amlodipine complex for possible L-type calcium channel imaging
- An improved analytical method for iodine-129 determination in low-level radioactive waste
Artikel in diesem Heft
- Frontmatter
- Nature of nano-sized plutonium particles in soils at the Hanford Site
- Studies on electrochemical behaviour on NpO22+/NpO2+ redox couple at single walled carbon nanotube modified glassy carbon electrode (SWCNT-GC)
- Study on the technology of U-Pu Co-stripping process for reprocessing spent fuel of fast reactor
- Use of the transpiration method to study polonium evaporation from liquid lead-bismuth eutectic at high temperature
- In-situ formation, thermal decomposition, and adsorption studies of transition metal carbonyl complexes with short-lived radioisotopes
- Production of 111In and 114mIn by proton induced reactions: an update on excitation functions, chemical separation – purification and recovery of target material
- Preparation and preliminary biological evaluation of radiogallium-labeled DTPA-amlodipine complex for possible L-type calcium channel imaging
- An improved analytical method for iodine-129 determination in low-level radioactive waste
