| Abstract: | Water samples for tritium/helium-3 age dating were collected from 12 shallow monitoring wells in the Portland basin, Oregon, in 1997, and again in 1998. Robust tritium/helium-3 apparent (piston-flow) ages were obtained for water samples from 10 of the 12 wells; apparent ages ranged from 1.1 to 21.2 years. Method precision was demonstrated by close agreement between data collected in 1997 and 1998. Tritium/helium-3 apparent ages generally increase with increasing depth below the water table, and agree well with age/depth relations based on assumptions of effects of recharge rate on vertical ground-water movement. |
| Genre: | USGS Numbered Series |
| ProdID: | 97369 |
| Citation Author: | Hinkle, Stephen R. |
| Citation Contributing Office: | Oregon Water Science Center |
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| Citation Edition: | - |
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| Citation Language: | ENGLISH |
| Citation Larger Work Title: | |
| Citation LatN: | 0454000 |
| Citation LatS: | 0452500 |
| Citation LonE: | -1223000 |
| Citation LonW: | -1225000 |
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| Citation Phsyical Description: | iv, 9 p. |
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| Citation Public Comments: | Prepared in cooperation with the City of Portland Bureau of Environmental Services |
| Citation Publisher: | U.S. Geological Survey |
| Citation Series: | Scientific Investigations Report |
| Citation Series Code: | SIR |
| Citation Series Number: | 2009-5057 |
| Citation Search Results Text: | Tritium/Helium-3 Apparent Ages of Shallow Ground Water, Portland Basin, Oregon, 1997-98; 2009; SIR; 2009-5057; Hinkle, Stephen R. |
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| Citation Year: | 2009 |
| Type: | citation/reference |
| Text: | Tritium/Helium-3 Apparent Ages of Shallow Ground Water, Portland Basin, Oregon, 1997-98; 2009; SIR; 2009-5057; Hinkle, Stephen R. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/usgs_thumb.jpg |
| URL (INDEX PAGE): | http://pubs.usgs.gov/sir/2009/5057/ |
| Date Other: | Sat, 14 Mar 2009 00:00 -0500 |
| Publisher: | U.S. Geological Survey |
