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BS ISO 4723:2023

BS ISO 4723:2023

$167.15

Water quality. Actinium-227. Test method using alpha-spectrometry

Published By Publication Date Number of Pages
BSI 2023 34
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PDF Catalog

PDF Pages PDF Title
2 National foreword
7 Foreword
8 Introduction
9 1 Scope
2 Normative references
10 3 Terms, definitions and symbols
3.1 Terms and definitions
3.2 Symbols
12 4 Principle
13 5 Sampling, handling and storage
6 Reagents and apparatus
6.1 Reagents
14 6.1.1 229Th standard solution.
6.1.13 Ethanol.
6.1.14 227Ac standard solution.
6.2 Apparatus
6.2.1 Vacuum filtration system.
6.2.3 Glass beakers.
6.2.4 Centrifuge.
6.2.8 Pipettes.
6.2.9 Hot plate.
15 6.2.10 Stirring plate.
6.2.11 Magnetic stirrer.
6.2.12 Metal discs with a sticky side.
6.2.13 Alpha spectrometer.
7 Procedure
7.1 Sample preparation
7.2 Coprecipitation
16 7.3 Purification
7.4 Thin layer source preparation
7.5 Measurement
8 Quality assurance and quality control program
8.1 General
8.2 Variables that can influence the measurement
8.3 Instrument verification
17 8.4 Contamination
8.5 Interference control
8.6 Method verification
8.7 Demonstration of analyst capability
9 Expression of results
9.1 General
9.2 Tracer activity added
18 9.3 Count rate and net count rate
9.4 Total recovery
9.5 Activity concentration of 227Ac in the sample
9.5.1 Direct measurement of 227Ac
19 9.5.2 Indirect measurement of 227Ac via 215Po peak after an ingrowth period
20 9.6 Combined uncertainties
21 9.7 Decision threshold
9.8 Detection limit
9.9 Probabilistically symmetric coverage interval
9.9.1 Limits of the probabilistically symmetric coverage interval
22 9.9.2 The shortest coverage interval
10 Test report
24 Annex A (informative) Potential radioactive interferences and examples of alpha spectrum
27 Annex B (normative) Preparation of alpha source by electrodeposition
30 Annex C (normative) Preparation of alpha source by lanthanide fluoride micro-precipitation
32 Bibliography

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BS ISO 4723:2023
$167.15