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BS ISO 24459:2021

BS ISO 24459:2021

$102.76

Determination of uranium content in samples coming from the nuclear fuel cycle by L-absorption edge spectrometry

Published By Publication Date Number of Pages
BSI 2021 20
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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.

PDF Catalog

PDF Pages PDF Title
2 National foreword
6 Foreword
7 1 Scope
2 Normative references
3 Terms and definitions
4 Principle
8 5 Reagents and materials
5.2 Uranium reference solutions.
6 Apparatus
9 6.1 X-ray tube.
6.2 Shielding and collimator.
6.3 Sample cell.
10 6.4 X-ray detector and multichannel analyser.
6.5 Software.
6.5.1 For data acquisition.
6.5.2 For data processing.
7 Method
7.1 Pre-checks
7.2 Reference spectrum
7.3 Calibration
11 7.4 Sample measurement
7.5 Spectrum evaluation
7.5.1 Region of interest
7.5.2 Smoothing (optional)
12 7.5.3 Background subtraction
7.5.4 Calculation of the X-ray transmission
13 7.6 Calculation of the concentration of uranium
14 7.7 Quality control
7.8 Uncertainty evaluation
7.8.1 Standard uncertainty of the calibration factor
7.8.2 Standard uncertainty of the uranium concentration
16 Annex A (informative) Calculation method for correction factors of atomic mass and temperature
17 Annex B (informative) Preparation of a solid quality control sample
19 Bibliography

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BS ISO 24459:2021
$102.76