20/30405427 DC

This standard 20/30405427 DC BS ISO 24459. Determination of Uranium content in samples coming from the Nuclear Fuel cycle by L-absorption Edge Spectrometry is classified in these ICS categories:

• 27.120.30 Fissile materials and nuclear fuel technology

This International Standard specifies a method for the determination of uranium concentrations in nitric acid or TBP-DILUANT (for example TBP-kerosene) solutions from reprocessing plants or other nuclear facilities.

The method is applicable:

1. For process control to solutions, which contain between 10 g/l to 300 g/l uranium.

2. For high accuracy purposes (Safeguards) to nitric acid solutions, which contain between 100 g/l and 220 g/l uranium with a target relative standard uncertainty of 0.2%.

The contents of neptunium and plutonium impurities in the solution should be less than 1% of the uranium content. For high accuracy purposes, the content of neutron poisons (Gadolinium, Er) should be less than 1% of the uranium content to ensure the absence of significant interferences at the level of required precision.

The method is applicable to solid samples as well, provided that they can be fully dissolved in nitric acid. The solution must be free of suspension.