Japan Atomic Energy Agency, Ibaraki 319-1195, Japan.
Japan Atomic Energy Agency, Ibaraki 319-1195, Japan.
Talanta. 2018 Aug 1;185:98-105. doi: 10.1016/j.talanta.2018.03.026. Epub 2018 Mar 14.
Estimating the risks associated with radiation from long-lived fission products (LLFP) in radioactive waste is essential to ensure the long-term safety of potential disposal sites. In this study, the amount of Zr, a LLFP, was determined by ICP-MS after separating Zr from a spent nuclear fuel solution using a microvolume anion-exchange cartridge (TEDA cartridge). Zirconium in 9.4 M HCl was stably retained on the TEDA cartridge and readily eluted with 0.75 mL of a mixed solution of 9.4 M HCl and 0.01 M HF. The time taken to complete the Zr separation was 1.2 min. Almost all the other elements initially present in the spent nuclear fuel sample were removed, leading to accurate measurement of all six Zr isotopes (Zr, Zr, Zr, Zr, Zr, and Zr). This demonstrated that the TEDA cartridge allowed highly selective separation of Zr regardless of its small bed volume of 0.08 cm. The concentrations of these isotopes were determined by an isotope-dilution method using a natural Zr standard that has a different isotopic composition from that of the spent nuclear fuel sample. The amount of Zr in an initial spent nuclear fuel pellet was 1081 ± 79 ng per mg of U. The measured concentrations of all Zr isotopes, as well as the isotopic composition, were consistent with values predicted using a burnup calculation code.
估算放射性废物中长寿命裂变产物（LLFP）辐射相关风险对于确保潜在处置场所的长期安全至关重要。在这项研究中，通过使用微体积阴离子交换柱（TEDA 柱）从乏核燃料溶液中分离 Zr 后，使用 ICP-MS 确定了 LLFP Zr 的含量。Zr 在 9.4M HCl 中稳定保留在 TEDA 柱上，并可容易地用 0.75mL 9.4M HCl 和 0.01M HF 的混合溶液洗脱。完成 Zr 分离所需的时间为 1.2 分钟。几乎所有最初存在于乏核燃料样品中的其他元素都被去除，从而可以准确测量所有六种 Zr 同位素（Zr、Zr、Zr、Zr、Zr 和 Zr）。这表明 TEDA 柱可以实现 Zr 的高度选择性分离，而与小床体积（0.08cm）无关。这些同位素的浓度通过使用天然 Zr 标准品的同位素稀释法确定，该标准品的同位素组成与乏核燃料样品不同。一个初始乏核燃料颗粒中的 Zr 含量为每毫克 U 为 1081±79ng。所有 Zr 同位素的测量浓度以及同位素组成与使用燃耗计算代码预测的值一致。
