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Using radon as an environmental tracer for estimating groundwater flow velocities in single‐well tests
Author(s) -
Schubert Michael,
Brueggemann Lutz,
Knoeller Kay,
Schirmer Mario
Publication year - 2011
Publication title -
water resources research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.863
H-Index - 217
eISSN - 1944-7973
pISSN - 0043-1397
DOI - 10.1029/2010wr009572
Subject(s) - tracer , radon , aquifer , groundwater , environmental science , groundwater flow , sampling (signal processing) , hydrology (agriculture) , residence time (fluid dynamics) , flow (mathematics) , soil science , geology , geotechnical engineering , engineering , mathematics , physics , electrical engineering , filter (signal processing) , quantum mechanics , nuclear physics , geometry
Naturally occurring radon‐222 was evaluated for its use in estimating groundwater flow velocities using single‐well tests. Investigations were carried out for four different well scenarios, which revealed the advantages and limitations of the approach. On one hand, it was shown that radon is useful as an environmental tracer because of (1) the low costs of the method, (2) the avoidance of any artificial tracer injection into the aquifer, (3) the immediate availability of results, and (4) the need for only a single monitoring well. On the other hand, several potential sources of error were identified, including poor sampling, inadequate hydraulic connection of the well because of a clogged screen, and an unsuitable well diameter resulting in excessively long or short well water residence times. The practical approach is supported by in‐depth theoretical considerations. General recommendations are presented concerning the use of radon as an environmental tracer for groundwater flow assessment.