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- W2564429069 abstract "A new method for accurate determination of oxygen isotopes in uranium oxides encountered in the nuclear fuel cycle was developed using the conventional BrF 5 fluorination technique. Laser‐assisted fluorination was tested for comparison. We focused on fine powders of triuranium octoxide (U 3 O 8 ), uranium dioxide (UO 2±x with 0 ≤ x ≤ 0.25), uranium trioxide (UO 3 . n H 2 O, with 0.8 ≤ n ≤ 2) and diuranates (M 2 U 2 O 7 . n H 2 O, with M = NH 4 , Na or Mg 0.5 and 0 ≤ n ≤ 6). Fluorination at room temperature and heating under vacuum at 150 °C are shown to eliminate both adsorbed and structural water from the powder samples. Precision fit for purpose of δ 18 O values (± 0.3‰, 1 s ) and oxygen yields (close to 100%) were obtained for U 3 O 8 and UO 2 where oxygen is only bound to uranium. A lower precision was observed for UO 3 . n H 2 O and M 2 U 2 O 7 . n H 2 O where oxygen is both present in the structural H 2 O and bonded to uranium and where the extracted O 2(g) can be contaminated by NF 3 and NO x compounds. Laser‐assisted fluorination gave shifted δ 18 O values between +0.8 and +1.4‰ for U 3 O 8 , around −0.8‰ for UO 3 . n H 2 O and between −3.9 and −4.5‰ for M 2 U 2 O 7 . n H 2 O (± 0.3‰, 1 s ) compared with the conventional method." @default.
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- W2564429069 date "2017-02-02" @default.
- W2564429069 modified "2023-10-05" @default.
- W2564429069 title "Enhanced Oxygen Isotope Determination in Uranium Oxides Using BrF<sub>5</sub> Fluorination" @default.
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- W2564429069 doi "https://doi.org/10.1111/ggr.12160" @default.
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