M00001348
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ISO 11665-7 1st Edition, July 15, 2012 Measurement of radioactivity in the environment - Air: radon-222 - Part 7: Accumulation method for estimating surface exhalation rate
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Availability date: 07/13/2021
Description / Abstract:
This part of ISO 11665 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. This
part of ISO 11665 is particularly applicable, however, in case of
an investigation, a search for sources or a comparative study of
exhalation rates at the same site. This part of ISO 11665 does not
cover calibration conditions for the rate estimation devices.
The measurement method described is applicable for radon
exhalation rates greater than 5 mBq/m2/s.
NOTE The uncertainty relating to the estimation of the result
obtained by applying this part of ISO 11665 cannot guarantee that
the true flux value is included in the uncertainty domain.