吸收边光谱法测定核燃料循环样品中的铀含量

[中文适用范围]： 本文件规定了核燃料循环中硝酸或 TBP-DILUANT（例如 TBP-煤油）溶液中铀浓度的测定方法。 该方法适用于 — 不含悬浮液的溶液的过程控制，其中含有 10 g/l 至 300 g/l 的铀，以及 — 用于高精度目的（保障），不含悬浮液的硝酸溶液，其中含有 10 g/l 至 300 g/l 的铀100 克/升和 220 克/升铀。 具有——溶液中镎和钚杂质的含量小于铀含量的1%。 — 中子毒物（钆、铒）含量低于铀含量的 1%，以确保在所需精度水平上不存在明显干扰，以实现高精度目的。 该方法也适用于固体样品，前提是它们可以完全溶解在硝酸中。 [外文原描述]： This document specifies a method for the determination of uranium concentrations in nitric acid or TBP-DILUANT (for example TBP-kerosene) solutions coming from the nuclear fuel cycle. The method is applicable — for process control of solutions, free of suspension, which contain between 10 g/l to 300 g/l uranium, and — for high accuracy purposes (Safeguards) to nitric acid solutions, free of suspension, which contain between 100 g/l and 220 g/l uranium. Having — the content of neptunium and plutonium impurities in the solution less than 1 % of the uranium content. — the content of neutron poisons (gadolinium, erbium) less than 1 % of the uranium content to ensure the absence of significant interferences at the level of required precision, for high accuracy purposes. The method is applicable to solid samples as well, provided that they can be fully dissolved in nitric acid.