Carbon isotopic data from test hole USW UZ-1, Yucca Mountain, Nevada
By: In C. Yang, C.A. Peters, and D.C. Thorstenson
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Abstract
Rock-CO2-gas analyses in test hole USW UZ-1 at Yucca Mountain indicate that gas movement in the unsaturated zone is likely through a dry-fracture system with little porewater or caliche-calcite interaction. This is because near-surface ??13C values are of biogenic origin and have changed little throughout the total depth. Post-bomb 14C activity is observed to the depth of about 12 m. An abrupt change in plotted 14C/depth slope is seen at 61 m. The less steep upper segment corresponds to the zone with greater porosity and moisture content, and consequently more tortuosity, with an estimated traveltime of 1.27 cm/yr; the steeper sloped zone corresponding to the lower segment has smaller porosity and moisture content but larger fracture density for gas transport, with an estimated traveltime of 3.26 cm/yr.
| Publication type | Conference Paper |
|---|---|
| Publication Subtype | Conference Paper |
| Title | Carbon isotopic data from test hole USW UZ-1, Yucca Mountain, Nevada |
| ISBN | 0872629503 |
| Year Published | 1993 |
| Language | English |
| Publisher | Publ by ASCE |
| Publisher location | New York, NY, United States |
| Larger Work Title | High Level Radioactive Waste Management |
| First page | 401 |
| Last page | 406 |
| Conference Title | Proceedings of the 4th Annual International Conference on High Level Radioactive Waste Management |
| Conference Location | Las Vegas, NV, USA |
| Conference Date | 26 April 1993 through 30 April 1993 |
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