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BS EN ISO 8299:2021 Nuclear fuel technology. Determination of the isotopic and elemental uranium and plutonium concentrations of nuclear materials in nitric acid solutions by thermal-ionization mass spectrometry >
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BS EN ISO 8299:2021 Nuclear fuel technology. Determination of the isotopic and elemental uranium and plutonium concentrations of nuclear materials in nitric acid solutions by thermal-ionization mass spectrometry, 2021
- undefined
- Foreword
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- 4 Principle
- 5 Reference materials and reagents
- 5.1 Spikes and reference materials
- 5.2 Other chemical reagents
- 5.3 Resin, applicable for separation/purification of Pu and U
- 5.3.1 General
- 5.3.2 Preparation of resin
- 6 Apparatus
- 7 Apparatus for mass spectrometry
- 8 Sample preparation
- 8.1 Subsampling and spiking
- 8.1.1 Pellet or powder samples
- 8.1.2 Concentrated nuclear fuel solution samples (such as reprocessing solution)
- 8.1.3 Plutonium nitrate solution samples (such as product solution from a reprocessing plant)
- 8.1.4 Dried nitrate samples
- 8.2 Chemical valency adjustment
- 8.2.1 Valence adjustment with ferrous solution
- 8.2.2 Valence adjustment with hydrogen peroxide
- 8.3 Sample separation/purification
- 8.3.1 Ion exchange with anion-exchange resin
- 8.3.2 Purification with extraction separation resins (see 5.3.1.2)
- 8.4 Replicate treatments
- 9 Filaments preparation
- 9.1 Degassing of filaments
- 9.2 Sample loading
- 9.2.1 Normal sample loading
- 9.2.2 Graphite loading technique
- 9.2.3 Resin-bead loading on single filaments for Pu samples
- 9.3 Filament mounting (filament assemblies preparation)
- 10 Instrument calibration
- 10.1 Mass calibration
- 10.2 Gain calibration for Faraday multi-detectors
- 10.3 Faraday detector calibration
- 10.4 Mass discrimination calibration
- 11 Isotopic mass spectrometric measurements
- 11.1 Total evaporation measurements using a single or double filament assembly and a multi-Faraday collector system
- 11.2 Bias correction method using a double filament assembly and a multi-Faraday collector system
- 12 Calculation of the results
- 12.1 Calculation of ion current intensities
- 12.2 Calculation of mean, weighted mean and standard deviation on a set of ratios xi, (i = 1…N)
- 12.3 Mass discrimination correction
- 12.4 Calculation of the atomic percent abundance Ai
- 12.5 Calculation of the isotopic mass percent Wj
- 12.6 Calculation of concentration
- 12.7 Isotope decay correction
- 13 Blanks
- 14 Quality control
- 15 Measurement uncertainty
- 15.1 Elemental assay
- 15.2 Isotopic analysis
- 16 Interferences
- Annex A (normative) Preparation and standardization of spike solutions
- Bibliography [Go to Page]