ISO 18589-3:2015
Measurement of radioactivity in the environment — Soil — Part 3: Test method of gamma-emitting radionuclides using gamma-ray spectrometry
ISO 18589-3:2015 specifies the identification and the measurement of the activity in soils of a large number of gamma-emitting radionuclides using gamma spectrometry. This non-destructive method, applicable to large-volume samples (up to about 3 000 cm3), covers the determination in a single measurement of all the γ-emitters present for which the photon energy is between 5 keV and 3 MeV.
ISO 18589-3:2015 can be applied by test laboratories performing routine radioactivity measurements as a majority of gamma-emitting radionuclides is characterized by gamma-ray emission between 40 keV and 2 MeV.
The method can be implemented using a germanium or other type of detector with a resolution better than 5 keV.
ISO 18589-3:2015 is addressed to people responsible for determining gamma-emitting radionuclides activity present in soils for the purpose of radiation protection.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms, definitions and symbols
3.1 Terms and definitions
3.2 Symbols
4 Principle
5 Gamma-spectrometry equipment
6 Sample container
7 Procedure
7.1 Packaging of samples for measuring purposes
7.2 Laboratory background level
7.3 Calibration
7.3.1 Energy calibration
7.3.2 Efficiency calibration
7.4 Measurements of and corrections for natural radionuclides
8 Expression of results
8.1 Calculation of the activity per unit of mass
8.1.1 General
8.1.2 Decay corrections
8.1.3 Self-absorption correction
8.1.4 Summation effects or coincidence losses corrections
8.2 Standard uncertainty
8.3 Decision threshold
8.4 Detection limit
8.5 Confidence limits
8.6 Corrections for contributions from other radionuclides and background
8.6.1 General
8.6.2 Contribution from other radionuclides
8.6.3 Contribution from background
9 Test report
Annex A (informative) Calculation of the activity per unit mass from a gamma spectrum using a linear background subtraction
Annex B (informative) Analysis of natural radionuclides in soil samples using gamma spectrometry
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms, definitions and symbols
3.1 Terms and definitions
3.2 Symbols
4 Principle
5 Gamma-spectrometry equipment
6 Sample container
7 Procedure
7.1 Packaging of samples for measuring purposes
7.2 Laboratory background level
7.3 Calibration
7.3.1 Energy calibration
7.3.2 Efficiency calibration
7.4 Measurements of and corrections for natural radionuclides
8 Expression of results
8.1 Calculation of the activity per unit of mass
8.1.1 General
8.1.2 Decay corrections
8.1.3 Self-absorption correction
8.1.4 Summation effects or coincidence losses corrections
8.2 Standard uncertainty
8.3 Decision threshold
8.4 Detection limit
8.5 Confidence limits
8.6 Corrections for contributions from other radionuclides and background
8.6.1 General
8.6.2 Contribution from other radionuclides
8.6.3 Contribution from background
9 Test report
Annex A (informative) Calculation of the activity per unit mass from a gamma spectrum using a linear background subtraction
Annex B (informative) Analysis of natural radionuclides in soil samples using gamma spectrometry
Bibliography