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ISO/WD 11665-9

Measurement of radioactivity in the environment — Air: Radon-222 — Part 9: Test methods for exhalation rate of building materials ISO/WD 11665-9

General information

20.60   Close of comment period   Apr 4, 2026

ISO

ISO/TC 85/SC 2 Radiological protection

International Standard

Scope

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.

Life cycle

PREVIOUSLY

PUBLISHED
ISO 11665-9:2019

NOW

IN_DEVELOPMENT
ISO/WD 11665-9
20.60 Close of comment period
Apr 4, 2026




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