This document specifies a method for the determination of the free radon exhalation rate of a batch of mineral based building materials. This document only refers to 222Rn exhalation determination using two test methods: liquid Scintillation Counting (LSC) and gamma ray spectrometry (see Annex A and Annex B). The exhalation of thoron (220Rn) does not affect the test result when applying the determination methods described in this document.
Sisällysluettelo
Foreword
Introduction
1 Scope
2 Normative references
3 Terms, definitions and symbols
3.1 Terms and definitions
3.2 Symbols
4 Principle
5 Reagents and equipment
5.1 Reagents
5.2 Equipment for sample preparation
5.3 Equipment for procedure
5.4 Test bench
6 Building material test sample preparation
6.1 General
6.2 Number and dimensions
6.3 Conditioning
7 Measurement
7.1 General
7.2 Set up of test bench
7.3 Measurement procedure
8 Expression of results
8.1 General
8.2 Free exhalation rate
8.3 Standard uncertainty
8.4 Decision threshold
8.5 Detection limit
9 Test report
Annex A Method for determination of free radon exhalation rate of mineral-based building materials — Total count determination using gamma-ray spectrometry (informative)
Annex B Method for determination of free radon exhalation rate of mineral-based building materials — Determination by nuclide-specific gamma-ray spectrometry (informative)
Annex A Method for determination of free radon exhalation rate of mineral-based building materials — Total count determination using gamma-ray spectrometry (informative)
Annex B Method for determination of free radon exhalation rate of mineral-based building materials — Determination by nuclide-specific gamma-ray spectrometry (informative)
ISO/IEC 17025 General requirements for the competence of testing and calibration laboratories
ISO 11665-1 Measurement of radioactivity in the environment — Air: radon-222 — Part 1: Origins of radon and its short-lived decay products and associated measurement methods
ISO 11929 Determination of the characteristic limits (decision threshold, detection limit and limits of the confidence interval) for measurements of ionizing radiation — Fundamentals and application
ISO/IEC 17025 General requirements for the competence of testing and calibration laboratories
ISO 11665-1 Measurement of radioactivity in the environment — Air: radon-222 — Part 1: Origins of radon and its short-lived decay products and associated measurement methods
ISO 11929 Determination of the characteristic limits (decision threshold, detection limit and limits of the confidence interval) for measurements of ionizing radiation — Fundamentals and application