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...
The Ultimate Scientific and Technical Reference
This article is included in
Preparing for construction
This offer includes:
Knowledge Base
Updated and enriched with articles validated by our scientific committees
Services
A set of exclusive tools to complement the resources
Practical Path
Operational and didactic, to guarantee the acquisition of transversal skills
Doc & Quiz
Interactive articles with quizzes, for constructive reading
Mechanism of radon release
Measuring radon emissions
Bibliography
Standards and norms
- Nuclear energy – Measuring radioactivity in the environment – Air – Radon 222: methods for integrated measurement of the mean volumetric activity of radon, in the atmospheric environment, with passive sampling and off-line analysis [cancelled on October 5, 2012, replaced by NF ISO 11665-4] - NF M60-766 - Septembre 2004
- Measuring radioactivity in the environment – Air: radon 222 – Part 4: Integrated measurement method...
Regulations
Code de la santé publique (new regulatory part) : Chapter 3 Ionizing radiation – Section 1 General measures to protect the population against ionizing radiation – Section 2 Exposure to ionizing radiation of natural origin – Articles R. 1333-1 to R. 1333-16.
Code de la santé publique (new legislative part) : Titre 3 Prévention des risques sanitaires liés à l'environnement et au travail – Chapter 3 Ionizing...
Directory
ALGADE
DOSIRAD Laboratory
National Cancer Institute
The Ultimate Scientific and Technical Reference
