Journal of Radioanalytical and Nuclear Chemistry

, Volume 279, Issue 1, pp 325–331 | Cite as

Measurement of radon emanation of drainage layer media by liquid scintillation counting



Slab-on-ground is a typical base floor construction type in Finland. The drainage layer between the slab and soil is a layer of sand, gravel or crushed stone. This layer has a minimum thickness of 200 mm and is sometimes even 600 mm thick, and thus may be a significant contributor to indoor air radon. In order to investigate radon emanation from the drainage layer material, a simple laboratory test was developed. Many organic solvents have high Ostwald coefficients for radon, i.e., the ratio of the volume of gas absorbed to the volume of the absorbing liquid, which enables direct absorption of radon into a liquid scintillation cocktail. Here, we first present equations relating to the processes of gas transfer in emanation measurement by direct absorption into liquid scintillation cocktails. In order to optimize the method for emanation measurement, four liquid scintillation cocktails were assessed for their ability to absorb radon from air. A simple apparatus consisting of a closed glass container holding an open liquid scintillation vial was designed and the diffusion/absorption rate and Ostwald coefficient were determined for a selected cocktail. Finally, a simple test was developed based on this work.


Radon Radon Concentration Direct Absorption Crushed Stone Radon Emanation 
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Copyright information

© Springer Science+Business Media, LLC. 2008

Authors and Affiliations

  1. 1.Radiation and Nuclear Safety Authority (STUK)HelsinkiFinland

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