Speciation of polonium released from molten lead bismuth
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J. Buongiorno
Abstract
The alpha-emitter 210Po is an activation product of liquid lead-bismuth, a low melting eutectic under investigation as a coolant of the next generation fast nuclear reactors. Experiments were performed to measure the gaseous polonium chemical species for assessing the radioactivity release from a Pb-Bi bath upon contact with a gas stream. The vapor pressure of lead polonide was measured over the 400-550°C temperature range and found to be in agreement with an existing correlation derived from data at higher temperatures. Also, it was experimentally confirmed that the presence of steam in the gas stream above the Pb-Bi melt substantially increases the amount of polonium released due to the formation of the volatile compound H2Po. The free-energy variation of the H2Po formation reaction was determined, permitting the calculation of the Po gas phase speciation under the experimental conditions.
© 2003 Oldenbourg Wissenschaftsverlag GmbH
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Articles in the same Issue
- Thermochromatographic studies of berkelium chlorides: BkCl3 and BkCl4
- Thermodynamics of extraction of Am(III) and Eu(III) from different anionic media with Tri-n-octyl phosphine oxide
- Influence of humic acid size on actinide complexation
- The role of oxidants in Pu-Th separation studies employing di(2-ethylhexyl)isobutyramide (D2EHIBA) as extractant
- Synthesis and properties of neptunium(VI,V) and plutonium(VI) pertechnetates
- Speciation of polonium released from molten lead bismuth
- Extraction separation of No-carrier-added astatine from bismuth target
- Enhanced extraction and separation of trivalent lanthanoids with 3-phenyl-4-(4-fluorobenzoyl)-5-isoxazolone and dicyclohexano-18-crown-6
- Thermodynamic modeling of metal–ligand interactions in high ionic strength NaCl solutions: the Ni2+-oxalate system
- Influence of surface charge of an Fe-oxide and an organic matter dominated soil on iodide and pertechnetate sorption
- Concentration distributions of radionuclides in sediments along the Romanian sector of the Danube River and the Black Sea coast
