| 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. |
| Genre: | Conference Paper |
| ProdID: | 70017843 |
| Citation Author: | Yang, In, C.; Peters, C. A.; Thorstenson, D. C. |
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| Citation End Page: | 406 |
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| Citation Language: | English |
| Citation Larger Work Title: | High Level Radioactive Waste Management |
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| Citation Number Of Pages: | 6 |
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| Citation Publisher: | Publ by ASCE |
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| Citation Search Results Text: | Carbon isotopic data from test hole USW UZ-1, Yucca Mountain, Nevada; 1993; Conference Paper; High Level Radioactive Waste Management; Yang, In, C.; Peters, C. A.; Thorstenson, D. C. |
| Citation Start Page: | 401 |
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| Citation Year: | 1993 |
| Type: | citation/reference |
| Text: | Carbon isotopic data from test hole USW UZ-1, Yucca Mountain, Nevada; 1993; Conference Paper; High Level Radioactive Waste Management; Yang, In, C.; Peters, C. A.; Thorstenson, D. C. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Fri, 1 Jan 1993 00:00 -0600 |
| Publisher: | Publ by ASCE |
