2. Mechanism of radon release
Radon escapes from a portion of radium trapped in a solid element (such as granite) thanks to its recoil kinetic energy of 86 keV (kiloelectron volts).
The emanation mechanism takes place in three stages: the recoil effect (direct recoil) propels (diffusion) the new element towards a permeable pore (dissolution), which may be air or water.
Radon emanation is a function of :
water content (emanation is four times stronger if the environment is saturated with water rather than dry):
radium localization;
granulometry ;
soil porosity ;
temperature ;
etc.
Only a part of the atoms produced by emanation reaches...
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Mechanism of radon release
Measuring radon emissions
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Bibliography
- (1) - CSTB - Guide de propositions de solutions techniques pour réduire la concentration en radon dans les bâtiments existants et dans les bâtiments neufs, - Cahiers du CSTB, Cahier 3143, août 1999).
Standards and norms
- Nuclear energy – Measuring radioactivity in...
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