I.S. EN ISO 22515:2021

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions, symbols, and units
3.1 General use
3.2 55Fe and 59Fe specific terms
4 Principle
5 Reagents
5.1 Standard solutions
5.1.1 Iron-55 and 59Fe standards
5.1.2 Stable iron standards
5.1.3 Chemical Quenching agent
5.1.4 Colour Quenching agent
5.2 Holdback carrier
5.3 Water
5.4 Specific reagents for chemical separation
5.4.1 Stable iron carrier solution
5.4.2 Ammonium hydroxide solution, c(NH4OH) = 4 mol l-1
5.4.3 Nitric acid solution, c(HNO3) = 7,2 mol l-1
5.4.4 Ammonium hydroxide solution, c(NH4OH) = 6 mol l-1
5.4.5 Hydrochloric acid, c(HCl) = 9 mol l-1
5.4.6 Hydrochloric acid, c(HCl) = 6 mol l-1
5.4.7 Hydrochloric acid, c(HCl) = 4 mol l-1
5.4.8 Hydrochloric acid, c(HCl) = 0,01 mol l-1
5.4.9 Nitric acid solution, c(HNO3) = 8 mol l-1
5.4.10 Nitric acid solution, c(HNO3) = 2 mol l-1
5.4.11 Sodium hydrogen phosphate, c(Na2HPO4) = 0,5 mol l-1
5.4.12 Hydrochloric acid, c(HCl) = 1 mol l-1
6 Equipment
6.1 Laboratory equipment for direct evaporation
6.2 Liquid scintillation vials
6.3 Measurement equipment: Liquid scintillation counter
7 Sampling and sample preparation
8 Liquid scintillation set up and calibration
8.1 Region setting
8.2 Background
8.3 Calibration
9 Procedure
9.1 Preliminary
9.1.1 Stable iron content
9.1.2 Iron separation
9.2 Iron-55 source preparation
10 Quality contro
11 Expression of results
11.1 Iron recovery
11.2 Detection efficiencies
11.2.1 55Fe detection efficiency
11.2.2 59Fe detection efficiency
11.3 Iron-55 activity
11.4 55Fe decision threshold and detection limit
11.5 Limits of the coverage intervals
11.5.1 Limits of the probabilistically symmetric coverage interval
11.5.2 The limits of the shortest coverage interval
12 Test report
Annex A (informative) Isolation and purification of iron
Annex B (informative) Analysis flow chart
Bibliography