NF EN ISO 24459, M60-479 (07/2023)

This document describes a method for determining uranium concentrations in solutions of nitric acid or TBP-DILUENT (e.g. TBP-kerosene) from the nuclear fuel cycle. This method is applicable — for process monitoring of solutions, free of suspended particles, which contain between 10 g/l and 300 g/l of uranium, and — for the control of fissile material, high precision analysis type guaranteed , nitric acid solutions, free from suspended particles, which contain between 100 g/l and 220 g/l of uranium, of which — the content of neptunium and plutonium impurities in the solution is less than 1% of the uranium content, — the content of neutron poisons (gadolinium, erbium) is less than 1% of the uranium content to ensure the absence of significant interference in the level of accuracy required, for high precision purposes. The method is also applicable to solid samples, provided they can be completely dissolved in nitric acid.
(Automatic translation from French)