Precise measurement of ²³⁴U/²³⁸U and ²³⁵U/²³⁸U isotope ratios was performed using multi-collector inductively coupled plasma mass spectrometry (MC-ICP-MS) in this study. The ²³⁴U ions were measured using a Daly detector, the ²³⁵U ions were measured using a Faraday cup with a 10¹² Ω resistor, and the ²³⁸U ions were measured using a Faraday cup with the usual 10¹¹ Ω resistor. Chemical separation of uranium was carried out by three different methods using either combinations of anion exchange and UTEVA resins or UTEVA resin three times. Chromatography combining three UTEVA resin columns provided the highest recovery (%) of uranium and biggest improvement in precise measurements of uranium isotope ratios. The certificate reference material (CRM) JLk-1 was used as an in-house standard for the uranium isotope ratio measurements. The long-term reproducibility of the in-house standard was 0.60% for ²³⁴U/²³⁸U and 0.05% for ²³⁵U/²³⁸U. The measured ratios were compared with the natural ratios, and the relative deviation obtained for uranium isotope ratios was less than 0.005% for ²³⁴U/²³⁸U and ²³⁵U/²³⁸U. Finally, the present method was applied to measure uranium isotope ratios in Fukushima microwave-digested soil samples.

在这项研究中，使用多收集器电感耦合等离子体质谱法（MC-ICP-MS）进行了²³⁴ U / ²³⁸ U和²³⁵ U / ²³⁸ U同位素比的精确测量。在^234个使用检测器达利测定ù离子时，^235个使用法拉第杯以10测定ü离子¹²  Ω电阻器，而^238个使用法拉第杯与通常的10测定ù离子¹¹ Ω电阻。通过三种不同的方法，使用阴离子交换和UTEVA树脂的组合或UTEVA树脂的组合进行3次化学分离铀。色谱法结合三个UTEVA树脂柱提供了最高的铀回收率（％），并且在精确测量铀同位素比方面获得了最大的改进。证书参考材料（CRM）JLk-1被用作铀同位素比测量的内部标准。内部标准的长期可重复性对于²³⁴ U / ²³⁸ U为0.60％，对于²³⁵ U / ²³⁸ U为0.05％。将测得的比值与自然比值进行比较，得出铀同位素比的相对偏差为²³⁴小于0.005％U / ²³⁸ U和²³⁵ U / ^238U。最后，本方法用于测量福岛微波消化的土壤样品中的铀同位素比。