ISO 11665-7:2012 gives guidelines for estimating the radon-222 surface exhalation rate over a short period (a few hours), at a given place, at the interface of the medium (soil, rock, laid building material, walls, etc.) and the atmosphere. This estimation is based on measuring the radon activity concentration emanating from the surface under investigation and accumulated in a container of a known volume for a known duration. This method is estimative only, as it is difficult to quantify the influence of many parameters in environmental conditions. ISO 11665-7:2012 is particularly applicable, however, in case of an investigation, a search for sources or a comparative study of exhalation rates at the same site. ISO 11665-7:2012 does not cover calibration conditions for the rate estimation devices.
Tämän julkaisun valmistelusta Suomessa vastaa Metalliteollisuuden Standardisointiyhdistys ry, puh. 09 19 231 (vaihde).
Sisällysluettelo
Foreword
Introduction
1 Scope
2 Normative references
3 Terms, definitions and symbols
3.1 Terms and definitions
3.2 Symbols
4 Principle of the measurement method for estimating surface exhalation rate
5 Equipment
6 Accumulation of radon in a container
6.1 Accumulation characteristics
6.2 Accumulation duration
7 Sampling
7.1 Sampling objective
7.2 Sampling characteristics
7.3 Sampling duration
7.4 Volume of air sampled
8 Detection method
9 Measurement
9.1 Procedure
9.2 Influence quantities
10 Expression of results
10.1 Radon surface exhalation rate
10.2 Standard uncertainty
10.3 Decision threshold and detection limit
10.4 Limits of the confidence interval
11 Test report
Annex A Example of a sample results sheet (informative)
Annex B Estimation of radon surface exhalation rate using a continuous measurement method (informative)
Annex C Estimation of radon surface exhalation rate using a spot measurement method (informative)
IEC 61577-1:2006
ISO 11665-1:2012 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 11665-5:2012 Measurement of radioactivity in the environment -- Air: radon-222 -- Part 5: Continuous measurement method of the activity concentration
IEC 61577-1:2006
ISO 11665-1:2012 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 11665-5:2012 Measurement of radioactivity in the environment -- Air: radon-222 -- Part 5: Continuous measurement method of the activity concentration
ISO 11665-6:2012 Measurement of radioactivity in the environment -- Air: radon-222 -- Part 6: Spot measurement method of the activity concentration
ISO/IEC 17025:2005 General requirements for the competence of testing and calibration laboratories