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ISO 20042:2019 Measurement of radioactivity - Gamma-ray emitting radionuclides - Generic test method using gamma-ray spectrometry >
ISO 20042:2019 Measurement of radioactivity - Gamma-ray emitting radionuclides - Generic test method using gamma-ray spectrometry, 2019
- Foreword
- Introduction
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- 4 Symbols and units
- 5 Principle
- 5.1 General
- 5.2 Summing method
- 5.3 Fitting method
- 6 Validating measurements by gamma-ray spectrometry
- 6.1 General
- 6.2 Step 1: customer requirements
- 6.3 Step 2: technical requirements
- 6.4 Step 3: detailed design
- 6.5 Step 4: installation
- 6.6 Step 5: validation studies
- 6.7 Step 6: robustness
- 6.8 Step 7: operation and maintenance
- 7 Nuclear decay data
- 7.1 Recommended nuclear decay data
- 7.2 Selection of gamma-ray photopeaks for inclusion in spectrum analysis libraries
- 7.3 Decay chains
- 8 Detector energy and efficiency calibration
- 8.1 Energy calibration
- 8.2 Efficiency calibration
- 8.3 Source(s) for energy calibration
- 8.4 Reference source(s) for efficiency calibration
- 8.4.1 General
- 8.4.2 Reference sources for laboratory systems
- 8.4.3 Reference sources used with numerical methods
- 9 Sample container
- 10 Procedure
- 10.1 Sample measuring procedure
- 10.1.1 Sampling
- 10.1.2 Sample preparation
- 10.1.3 Loading the sample container
- 10.1.4 Recording the sample spectrum
- 10.2 Analysis of the spectrum
- 10.2.1 Procedure for laboratory-based measuring systems
- 10.2.2 Background corrections
- 11 Expression of results
- 11.1 Calculation of activity and activity per kg (or m3) of sample
- 11.2 Determination of the characteristic limits
- 12 Test report
- Annex A (informative) Quality assurance and quality control program
- Annex B (informative) Corrections to the analysis process
- Annex C (informative) Uncertainty budget
- Annex D (informative) Detector types
- Annex E (informative) Example: Calculation of 137Cs activity content and characteristic limits in an aqueous sample
- Annex F (informative) Example: Simulating correction factors for sample positioning, geometry, matrix, density and true summing
- Bibliography [Go to Page]