Tritium/Helium-3 Apparent Ages of Shallow Ground Water, Portland Basin, Oregon, 1997-98
Scientific Investigations Report
2009-5057
Prepared in cooperation with the City of Portland Bureau of Environmental Services
By: Stephen R. Hinkle
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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.
Suggested Citation
Hinkle, S.R., 2009, Tritium/Helium-3 Apparent Ages of Shallow Ground Water, Portland Basin, Oregon, 1997-98: U.S. Geological Survey Scientific Investigations Report 2009-5057, iv, 9 p., https://doi.org/10.3133/sir20095057.
ISSN: 2328-0328 (online)
Study Area
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | Tritium/Helium-3 Apparent Ages of Shallow Ground Water, Portland Basin, Oregon, 1997-98 |
| Series title | Scientific Investigations Report |
| Series number | 2009-5057 |
| DOI | 10.3133/sir20095057 |
| Year Published | 2009 |
| Language | ENGLISH |
| Publisher | U.S. Geological Survey |
| Contributing office(s) | Oregon Water Science Center |
| Description | iv, 9 p. |
| Time Range Start | 1997-01-01 |
| Time Range End | 1998-12-31 |
| Additional Online Files (Y/N) | Y |