Significance of apparent discrepanices in water ages derived from atmospheric radionuclides at Yucca Mountain, Nevada

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Cosmogenic {sup 36}Cl and {sup 14}C produced in the atmosphere are being used to estimate water residence times in the unsaturated zone at Yucca Mountain. Results thus far show a systematic discordance in that {sup 14}C-based ages are generally one to two orders of magnitude younger than {sup 36}Cl-based ages. This lack of concordance probably arises from one or more of the following reasons: (1) different transport mechanisms, e.g., vapor transport for {sup 14}C; (2) different magnitudes and timing of bomb-pulse signals; (3) mixing of waters from different flow paths; and (4) possibly inadequate methods for correcting for the effect ... continued below

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11 p.

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Liu, B.; Fabryka-Martin, J.; Wolfsberg, A.; Robinson, B. & Sharma, P. February 23, 1995.

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Cosmogenic {sup 36}Cl and {sup 14}C produced in the atmosphere are being used to estimate water residence times in the unsaturated zone at Yucca Mountain. Results thus far show a systematic discordance in that {sup 14}C-based ages are generally one to two orders of magnitude younger than {sup 36}Cl-based ages. This lack of concordance probably arises from one or more of the following reasons: (1) different transport mechanisms, e.g., vapor transport for {sup 14}C; (2) different magnitudes and timing of bomb-pulse signals; (3) mixing of waters from different flow paths; and (4) possibly inadequate methods for correcting for the effect of sample contamination by carbon or chlorine from sources other than the infiltrating water. Preliminary numerical simulation results using the FEHMN code suggest that spatial variation in infiltration rates can enhance lateral flow and mixing that leads to discordance in apparent ages depending on the dating technique. Examples are presented to show that disparate radiometric ages are inevitable and to be expected where mixing of waters of markedly different ages occurs.

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11 p.

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INIS; OSTI as DE95007886

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  • 1995 American Institute of Hydrology annual meeting, Denver, CO (United States), 14-18 May 1995

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  • Other: DE95007886
  • Report No.: LA-UR--95-572
  • Report No.: CONF-9505188--1
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 26681
  • Archival Resource Key: ark:/67531/metadc672890

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  • February 23, 1995

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  • June 29, 2015, 9:42 p.m.

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  • Feb. 26, 2016, 5:40 p.m.

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Liu, B.; Fabryka-Martin, J.; Wolfsberg, A.; Robinson, B. & Sharma, P. Significance of apparent discrepanices in water ages derived from atmospheric radionuclides at Yucca Mountain, Nevada, article, February 23, 1995; New Mexico. (digital.library.unt.edu/ark:/67531/metadc672890/: accessed December 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.