Removal of radon-220 from HTGR fuel reprocessing and refabrication off-gas streams by adsorption (based on a literature survey)

Ackley, R.D.

doi:10.2172/4212719

Cited by 11 publications

(8 citation statements)

References 15 publications

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“…Therefore, great interest exists in Rn filters. These filters should guarantee removal of Rn, especially in uranium mining, uranium processing, and nuclear fuel processing and refabrication. ,− With respect to sorption capacity, charcoal surpasses molsieves and silica gel remarkably …”

Section: Introductionmentioning

confidence: 99%

Adsorption of Radon on Ice Surfaces

2000

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The differential molar adsorption enthalpy of radon at zero coverage on the surface of laboratory made ice was determined by the method of low-temperature thermochromatography. Spherical ice particles were prepared as the stationary phase. For the investigation, the short-lived radon isotope 220 Rn was used, generated with a 232 U-emanation source. Helium served as carrier gas. At a temperature of about 100 K, sharp adsorption peaks of the 220 Rn atoms (∼10 8 ) were measured. From the measured deposition temperatures the adsorption enthalpy on the surface of the ice spheres was determined as ∆H ads ) -19.2 ( 1.6 kJ/mol. This value is compared with data from the literature for adsorption enthalpies of radon on different solid surfaces. From the estimated solution enthalpy of radon in water and the formation enthalpy of a hypothetical "Rn chlathrate hydrate", it follows that Rn is adsorbed on the ice surface as a free atom. The measured adsorption enthalpy indicates that Rn and ice are not isomorphous and that Rn shows no solubility in the solid phase.

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Section: Introductionmentioning

confidence: 99%

Adsorption of Radon on Ice Surfaces

2000

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“…The first focused on a fimdamental derivation of equations describing the removal of 222Rn from air streams (Blue et al 1995), while the second focused on the removal of 22!Rn (Ackley 1975). Neither paper contained measurement data of radon filtration from a moving gas stream.…”

Section: Abriefoverviewmentioning

confidence: 99%

Use of Activated Charcoal for {sup 220}Rn Adsorption for Operations Associated with the Uranium Deposit in the Auxiliary Charcoal Bed at the Molten Salt Reactor Experiment Facility

Coleman¹

1999

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“…While 222 Rn has little commercial value, there is significant interest in its detection and remediation. − Research has been performed to assess such properties of radon-222 as solution behavior, − diffusion characteristics, − transport rates, − and adsorption ,− and absorption ,,− behavior. Computer simulations have also been used to study radon, including crystal properties, solution behavior, ,− and absorption into porous solids. − The Lennard-Jones parameters used in these simulations were derived from correlations of the dispersion energy and the atomic polarizability with the number of electrons, − or corresponding states theory .…”

Section: Introductionmentioning

confidence: 99%

Prediction of Radon-222 Phase Behavior by Monte Carlo Simulation

2016

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Histogram-reweighting Monte Carlo simulations in the grand canonical ensemble are used to determine saturated liquid and vapor densities, vapor pressures, heats of vaporization, and compressibility factors for radon-222 from the normal boiling point to the critical point. An optimized intermolecular potential is developed by fitting parameters to reproduce experimental vapor pressures and the critical temperature. Vapor pressures are reproduced by simulation to within 2.2% of experiment, while the critical temperature and normal boiling point are reproduced exactly within the combined uncertainty of simulation and experimental data. The predictions of simulation are used to evaluate the reliability of reported experimental liquid densities, and those predicted by equations of state. While the predictions of simulation are in agreement with equations of state for the liquid density, significant differences are observed between the predictions of simulation and experiment. These results suggest that previously reported experimental liquid densities for radon-222 may be erroneous.

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Removal of radon-220 from HTGR fuel reprocessing and refabrication off-gas streams by adsorption (based on a literature survey)

Cited by 11 publications

References 15 publications

Adsorption of Radon on Ice Surfaces

Adsorption of Radon on Ice Surfaces

Use of Activated Charcoal for {sup 220}Rn Adsorption for Operations Associated with the Uranium Deposit in the Auxiliary Charcoal Bed at the Molten Salt Reactor Experiment Facility

Prediction of Radon-222 Phase Behavior by Monte Carlo Simulation

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