Document Detail


Improved automated analysis of radon (222Rn) and thoron (220Rn) in natural waters.
MedLine Citation:
PMID:  20028058     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Natural radon ((222)Rn) and thoron ((220)Rn) can be used as tracers of various chemical and physical processes in the environment. We present here results from an extended series of laboratory experiments intended to improve the automated analysis of (222)Rn and (220)Rn in water using a modified RAD AQUA (Durridge Inc.) system. Previous experience with similar equipment showed that it takes about 30-40 min for the system to equilibrate to radon-in-water concentration increases and even longer for the response to return to baseline after a sharp spike. While the original water/gas exchanger setup was built only for radon-in-water measurement, our goal here is to provide an automated system capable of high resolution and good sensitivity for both radon- and thoron-in-water detections. We found that faster water flow rates substantially improved the response for both isotopes while thoron is detected most efficiently at airflow rates of 3 L/min. Our results show that the optimum conditions for fastest response and sensitivity for both isotopes are at water flow rates up to 17 L/min and an airflow rate of 3 L/min through the detector. Applications for such measurements include prospecting for naturally occurring radioactive material (NORM) in pipelines and locating points of groundwater/surface water interaction.
Authors:
Natasha Dimova; William C Burnett; Derek Lane-Smith
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Publication Detail:
Type:  Evaluation Studies; Journal Article; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Environmental science & technology     Volume:  43     ISSN:  0013-936X     ISO Abbreviation:  Environ. Sci. Technol.     Publication Date:  2009 Nov 
Date Detail:
Created Date:  2009-12-23     Completed Date:  2010-01-21     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0213155     Medline TA:  Environ Sci Technol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  8599-603     Citation Subset:  IM    
Affiliation:
Department of Oceanography, Florida State University, Tallahassee, Florida 32306, USA. dimova@ocean.fsu.edu
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MeSH Terms
Descriptor/Qualifier:
Automation
Fresh Water / chemistry*
Radiation Monitoring / instrumentation*,  methods*
Radon / analysis*
Water Pollutants, Radioactive / chemistry*
Chemical
Reg. No./Substance:
0/Water Pollutants, Radioactive; 10043-92-2/Radon

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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