Uranium Isotope Exchange between Uranium Hexafluoride and Uranium Pentafluoride

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To aim at a better understanding of the uranium isotope exchange reaction between gaseous UF<SUB>6</SUB> and solid UF5. experiments were done with natural UF<SUB>6</SUB> gas and solid UF<SUB>5</SUB> containing 3% <SUP>235</SUP>U under different pressures of UF<SUB>6</SUB>. The experimental results suggest a two-process reaction with an initial rapid increase of <SUP>235</SUP>UF<SUB>6</SUB> in the gas phase followed by its slight and gradual increase. A rate equation based on a collision model is given for the two-process reaction which includes a primary exchange reaction on the solid surface and a secondary reaction participated by underlying UF<SUB>5</SUB> molecules. An analytical solution is provided for both of <SUP>235</SUP>UF<SUB>6</SUB> concentration in the gas phase and <SUP>235</SUP>UF<SUB>5</SUB> concentration on the solid surface, which is useful for determining the parameters characterizing the exchange reaction. A numerical analysis is also made to evaluate the influence of gas samplings. A remarkable agreement is found between the particle sizes of UF<SUB>5</SUB> estimated from the reaction parameter and from the direct observation with an electron microscope. The depletion of <SUP>235</SUP>UF<SUB>5</SUB> concentration by the exchange reaction is very small when averaged over the whole solid UF<SUB>5</SUB>, because the depletion is virtually limited to the solid surface due to the small reaction probability of underlying UF<SUB>5</SUB> molecules.

収録刊行物

  • Journal of nuclear science and technology

    Journal of nuclear science and technology 32(5), 430-438, 1995-05-25

    Atomic Energy Society of Japan

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各種コード

  • NII論文ID(NAID)
    10002072553
  • NII書誌ID(NCID)
    AA00703720
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    00223131
  • データ提供元
    CJP書誌  CJP引用  J-STAGE 
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