Determination of fluorine in uranium oxyfluoride particles as an indicator of particle age

Kips, R; Pidduck, A.J.; Houlton, M. R.; Leenaers, A.; Macé, J.; Marie, Olivier; Pointurier, Fabien; Stefaniak, E.; Taylor, Phillip; Berghe, S. Van den; Espen, P. Van; Grieken, R. Van; Wellum, R.

doi:10.1016/j.sab.2008.12.001

Cited by 35 publications

(47 citation statements)

References 14 publications

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“…The NUSIMEP-6 particles used in the Nuclear Signatures Interlaboratory Measurement Evaluation Programme [23] have a close to natural uranium (NU) isotopic composition while the particles prepared from the IRMM-722 (2% enriched in 235 U) and NBS-U200 (20% enriched in 235 U) reference materials correspond to low (LEU) and highly (HEU) enriched uranium particles, respectively. Such particles are produced in a special aerosol deposition chamber from the controlled hydrolysis of certified uranium hexafluoride gas and collected in situ onto graphite planchets (25 mm Ø, Schunk, Germany) [24,25]. Graphite is widely used as planchet material in order to make the samples electrically conductive, as required for SEM/EDX and SIMS analysis.…”

Section: Methodsmentioning

confidence: 99%

Development of an improved method to perform single particle analysis by TIMS for nuclear safeguards

Kraiem

Stephan

Kühn

et al. 2011

Analytica Chimica Acta

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Section: Methodsmentioning

confidence: 99%

Development of an improved method to perform single particle analysis by TIMS for nuclear safeguards

Kraiem

Stephan

Kühn

et al. 2011

Analytica Chimica Acta

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“…Equally important is understanding physical and chemical changes in these products as a function of controlled storage conditions of temperature and relative humidity [14,20].…”

Section: Resultsmentioning

confidence: 99%

“…A glass or metal sample holder with UF 6 was pressurized with heat, allowing the UF 6 to be released as a liquid. Analyses of the products formed indicated that aggregate particle morphologies and size distributions of the settled products were dependent upon relative humidity, temperature of the UF 6 , and time (hours) [14,15]. In this latter study, UF 6 was contained in glass that was mechanically ruptured, allowing the compound to hydrolyze with air in a surrounding enclosure.…”

Section: *Manuscriptmentioning

confidence: 87%

“…Micro-Raman spectroscopy was employed to measure UO 2 F 2 from UF 6 -residue powder‖ from hot UF 6 released to static, humid room air conditions [16]. Kips noted that UO 2 F 2 was present in UF 6 hydrolysis products after storage under UV light [14]. The dynamic relationships between UO 2 F 2 , H 2 O, HF, and UO 2 F 2 ·xH 2 ·yHF products in aerosols formed from release of hot, pressurized UF 6 gas into ambient air were probed by FourierTransform Infrared (FT-IR) spectroscopy [17].…”

Section: *Manuscriptmentioning

confidence: 99%

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Morphologic and chemical characterization of products from hydrolysis of UF6

Wagner

Kinkead

Paffett

et al. 2015

Journal of Fluorine Chemistry

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A c c e p t e d M a n u s c r i p t 1 HIGHLIGHTS  UF 6 hydrolysis was carried out under reaction conditions that were water deficient for preparation of UO 2 F 2 products. SEM Images of products of UF 6 hydrolysis deposited onto carbon conducting tape and aluminum tape showed different morphologies.  Morphologies of material deposited on aluminum after hydrolysis of UF 6 and stored under high humidity conditions change after one week.  Chemical characterization by powder X-ray diffraction analysis and -Fourier Transform Infrared Spectroscopy revealed formation of UOF 4 , a likely reaction intermediate in UF 6 hydrolysis.ABSTRACT: Characterization of the chemical speciation and morphologies of products formed from hydrolysis of uranium hexafluoride (UF 6 ) is important for predicting dispersion and contamination of released material, or health consequences from inhalation of air-borne particles. We report products of hydrolysis of UF 6 in which the quantity of water was insufficient for complete formation of UO 2 F 2 . Material was deposited onto carbon tape and aluminum. Scanning Electron Microscopy was employed to characterize textures and particle sizes, and powder X-ray diffraction analysis and μ-Fourier Transform Infrared Absorption spectroscopy were used to characterize chemical speciation. These results revealed that the ratio of H 2 O to UF 6, depository substrate composition, and storage conditions must be considered when evaluating chemical speciation, morphologic textures and particles size of UF 6 hydrolysis products. LA-UR-15-23846.

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“…Kips et al [15] investigated the propertie s of uranyl fluoride particles formed as aerosol in a specially designed chamber. UF 6 hydrolysis was carried out inside the aerosol chamber in ambient air with sufficient humidity .…”

Section: Introductionmentioning

confidence: 99%

New insight into UO2F2 particulate structure by micro-Raman spectroscopy

Stefaniak

Darchuk

Sapundjiev

et al. 2013

Journal of Molecular Structure

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h i g h l i g h t s " Uranyl fluoride particles prepared via hydrolysis of UF 6 were deposited on metallic substrates for micro-Raman spectroscopy." New substrates enhanced Raman signal from the particles of the size below 1 lm." Raman shift of U-O symmetric stretching appeared at values 847/842/839 cm À1 due to gradual water absorption by UO 2 F 2 . " The smooth substrates fa cilitated the process of water saturation of deposited particulate uranyl fluoride. " UO 2 F 2 particles deposited of metallic surfaces appeared very stable under long-term exposure of a laser beam. a b s t r a c tUranyl fluoride particles produced via hydrolysis of uranium hexafluoride have been deposited on different substrates: polished graphite disks, silver foil, stainless steel and gold-coated silicon wafer, and measured with micro-Raman spectroscopy (MRS). All three metallic substrates enhanced the Raman signal delivered by UO 2 F 2 in comparison to graphite. The fundamental stretching of the U-O band appeared at 867 cm À1 in case of the graphite substrate, while in case of the others it was shifted to lower frequencies (down to 839 cm À1 ). All applied metallic substrates showed the expected effect of Raman signal enhanceme nt; however the gold layer app eared to be most effective. Application of new substrates provides more infor mation on the molecular structure of uranyl fluoride precipitation, which is interesting for nuclear safeguards and nuclear environmen tal analysis.

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Determination of fluorine in uranium oxyfluoride particles as an indicator of particle age

Cited by 35 publications

References 14 publications

Development of an improved method to perform single particle analysis by TIMS for nuclear safeguards

Development of an improved method to perform single particle analysis by TIMS for nuclear safeguards

Morphologic and chemical characterization of products from hydrolysis of UF6

New insight into UO2F2 particulate structure by micro-Raman spectroscopy

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