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首页> 外文期刊>Journal of nuclear science and technology >Isotope Exchange Reaction between U-235 Enriched Uranium Pentafluoride Particles and Natural Uranium Hexafluoride Gas
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Isotope Exchange Reaction between U-235 Enriched Uranium Pentafluoride Particles and Natural Uranium Hexafluoride Gas

机译：富含U-235的五氟化铀颗粒与天然六氟化铀气体之间的同位素交换反应

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Molecular laser isotope separation (MLIS) is an attractive technique for 235U enrichment from natural uranium hexafluoride (UF6). In MLIS at RIKEN, the v3 vibrational mode (628 cm-1) of supercooled 235UF6 in natural UF6/Ar mixture is selectively excited and successively dissociated with a multi-frequency para-H2 Raman laser to produce nonvolatile 235U pentafluoride (235UF5). The 235UF5 molecules thus formed are immediately aggregated to form particles. These 235U enriched UF5 particles are collected on an impactor plate, and they are easily separated from the reactant gas(1)(2). Grigore'v et al.(3) have recently reported on an isotope exchange reaction between 235UF6 and 235UF6 that reduced the isotope ratio of the enriched UF5 particles as shown in the following equation : 235UF5(solid)+235UF6(gas) →←235UF6(gas)+238UF5(solid).( 1 )Consequently, the apparent separation factor of MLIS decreased. According to their report, this exchange process (Eq. ( 1 )) progressed at two rates : a fast process due to the exchange reaction between the outermost layer of the enriched UF5 particles and the UF6 gas, and a slow process due to the exchange reaction between underlying layers of the UF5 particles and the gas. From fitting a calculated result to experimental data, they obtained an exchange reaction probability of 1.1×10-9, and a participation probability of the underlying layer in this exchange reaction of 0.6. However, the agreement of their calculated result with experimental data by a numerical method alone does not verify their reaction model. The analytical solution of this exchange reaction, if it can be obtained, is preferable, since then the model can be verified by a dimensionless plot, deduced directly from the analytical solution, of the experimental results. Assuming Eq. ( 1 ) is a bimolecular-type, reversible, first-order reaction, we present in this note a kinetical analysis of our experimental data obtained using 7% 235U enriched UF5 particles and natural UF6 gas.
机译：分子激光同位素分离（MLIS）是从天然六氟化铀（UF6）富集235U的一种有吸引力的技术。在RIKEN的MLIS中，自然激发的UF6 / Ar混合物中过冷的235UF6的v3振动模式（628 cm-1）被选择性激发，并随后用多频对H2拉曼激光离解，产生不挥发的235U五氟化物（235UF5）。如此形成的235UF5分子立即聚集形成颗粒。这些富含235U的UF5颗粒被收集在撞击板上，并且很容易从反应气体中分离出来（1）（2）。 Grigore'v等人（3）最近报道了235UF6和235UF6之间的同位素交换反应，降低了富集的UF5颗粒的同位素比，如下式所示：235UF5（固体）+ 235UF6（气体）→←235UF6 （气体）+ 238UF5（固体）。（1）因此，MLIS的表观分离因子降低。根据他们的报告，这种交换过程（等式（1））以两种速率进行：由于富集的UF5颗粒的最外层与UF6气体之间发生交换反应而产生的快速过程，以及由于交换而产生的缓慢过程。 UF5颗粒下层与气体之间的反应。通过将计算结果拟合到实验数据，他们获得了1.1×10-9的交换反应概率，以及基础层参与该交换反应的概率为0.6。但是，仅通过数值方法将其计算结果与实验数据相吻合并不能验证其反应模型。如果可以得到这种交换反应的分析溶液，则是优选的，因为这样可以通过直接从分析溶液中推导出的实验结果的无因次图来验证模型。假设式（1）是双分子型，可逆的一级反应，我们在本笔记中介绍了对使用7％235U富集的UF5颗粒和天然UF6气体获得的实验数据的动力学分析。

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