Document Detail

Radon (222Rn) level variations on a regional scale: influence of the basement trace element (U, Th) geochemistry on radon exhalation rates.
MedLine Citation:
PMID:  11378929     Owner:  NLM     Status:  MEDLINE    
The approach proposed in this study provides insight into the influence of the basement geochemistry on the spatial distribution of radon (222Rn) levels both at the soil/atmosphere interface and in the atmosphere. We combine different types of in situ radon measurements and a geochemical classification of the lithologies, based on 1/50,000 geological maps, and on their trace element (U, Th) contents. The advantages of this approach are validated by a survey of a stable basement area of Hercynian age, located in South Brittany (western France) and characterized by metamorphic rocks and granitoids displaying a wide range of uranium contents. The radon source-term of the lithologies, their uranium content, is most likely to be the primary parameter which controls the radon concentrations in the outdoor environment. Indeed, the highest radon levels (> or = 100 Bq m-3 in the atmosphere, > or = 100 mBq m-2 s-1 at the surface of the soil) are mostly observed on lithologies whose mean uranium content can exceed 8 ppm and which correspond to peraluminous leucogranites or metagranitoids derived from uraniferous granitoids.
G Ielsch; D Thiéblemont; V Labed; P Richon; G Tymen; C Ferry; M C Robé; J C Baubron; F Béchennec
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of environmental radioactivity     Volume:  53     ISSN:  0265-931X     ISO Abbreviation:  J Environ Radioact     Publication Date:  2001  
Date Detail:
Created Date:  2001-05-29     Completed Date:  2001-06-28     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  8508119     Medline TA:  J Environ Radioact     Country:  England    
Other Details:
Languages:  eng     Pagination:  75-90     Citation Subset:  IM    
Institut de Protection et de Sureté Nucléaire, DPRE/SERGD/LEIRPA, B.P. 6, 92265 Fontenay-aux-Roses, France.
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MeSH Terms
Geological Phenomena
Radon / analysis*
Trace Elements
Uranium / analysis
Reg. No./Substance:
0/Soil; 0/Trace Elements; 10043-92-2/Radon; 7440-61-1/Uranium

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