本文件规定了一种测定核燃料循环产生的硝酸或TBP稀释剂（例如TBP煤油）溶液中铀浓度的方法。 该方法是适用的 -？用于溶液的过程控制，不含悬浮液，含10？g/l至300？g/l铀，以及 -？用于高精度（防护）硝酸溶液，不含悬浮液，其中含有100？g/l至220？g/l铀。 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）的含量小于铀含量的1%，以确保在要求的精度水平上没有重大干扰，达到高精度目的。 该方法也适用于固体样品，前提是它们能在硝酸中完全溶解。

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.