ISO 11665-4:2021
Measurement of radioactivity in the environment — Air: radon-222 — Part 4: Integrated measurement method for determining average activity concentration using passive sampling and delayed analysis
This document describes radon-222 integrated measurement techniques with passive sampling. It gives indications for determining the average activity concentration of the radon-222 in the air from measurements based on easy-to-use and low-cost passive sampling, and the conditions of use for the sensors.
This document covers samples taken without interruption over periods varying from a few days to one year.
This measurement method is applicable to air samples with radon activity concentrations greater than 5 Bq/m3.
Foreword
Introduction
1 Scope
2 Normative references
3 Terms, definitions and symbols
3.1 Terms and definitions
3.2 Symbols
4 Principle
5 Equipment
6 Sampling
6.1 Sampling objective
6.2 Sampling characteristics
6.3 Sampling conditions
6.3.1 General
6.3.2 Installation of the sensor
6.3.3 Sampling duration
6.3.4 Volume of air sampled
7 Detection
8 Measurement
8.1 Procedure
8.2 Influence quantities
8.3 Calibration
8.4 Average radon activity concentration
8.5 Standard uncertainty
8.6 Decision threshold and detection limit
8.7 Limits of the confidence interval
9 Test report
Annex A (normative) Measurement method using a solid-state nuclear track detector (SSNTD)
Annex B (normative) Measurement method using an electret detector
Annex C (normative) Measurement method using activated charcoal
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 Equipment
6 Sampling
6.1 Sampling objective
6.2 Sampling characteristics
6.3 Sampling conditions
6.3.1 General
6.3.2 Installation of the sensor
6.3.3 Sampling duration
6.3.4 Volume of air sampled
7 Detection
8 Measurement
8.1 Procedure
8.2 Influence quantities
8.3 Calibration
8.4 Average radon activity concentration
8.5 Standard uncertainty
8.6 Decision threshold and detection limit
8.7 Limits of the confidence interval
9 Test report
Annex A (normative) Measurement method using a solid-state nuclear track detector (SSNTD)
Annex B (normative) Measurement method using an electret detector
Annex C (normative) Measurement method using activated charcoal
Bibliography