Observation of time dependent dispersion in laboratory scale experiments with intact tuff

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The migration of radionuclides through intact tuff was studied using tuff from Yucca Mountain, Nevada. The tuff samples were both highly zeolitized ash-fall tuff from the Calico Hills and densely welded devitrified tuff from the Topopah Springs member of the Paintbrush tuff. Tritiated water and pertechnetate were used as conservative tracers. The sorbing tracers {sup 85}Sr, {sup 137}Cs, and {sup 133}Ba were used with the devitrified tuff only. Greater tailing in the elution curves of the densely welded tuff samples was observed that could be fit by adjusting the dispersion coefficient in the conventional Advection Dispersion Equation, ADE. The curves ... continued below

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14 p.

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Rundberg, R.S.; Triay, I.R.; Ott, M.A. & Mitchell, A.J. December 1, 1989.

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The migration of radionuclides through intact tuff was studied using tuff from Yucca Mountain, Nevada. The tuff samples were both highly zeolitized ash-fall tuff from the Calico Hills and densely welded devitrified tuff from the Topopah Springs member of the Paintbrush tuff. Tritiated water and pertechnetate were used as conservative tracers. The sorbing tracers {sup 85}Sr, {sup 137}Cs, and {sup 133}Ba were used with the devitrified tuff only. Greater tailing in the elution curves of the densely welded tuff samples was observed that could be fit by adjusting the dispersion coefficient in the conventional Advection Dispersion Equation, ADE. The curves could be fit using time dependent dispersion as was previously observed for sediments and alluvium by Dieulin, Matheron, and de Marsily. The peak of strontium concentration was expected to arrive after 1.5 years based on the conventional ADE and assuming a linear K{sub d} of 26 ml/g. The observed elution had significant strontium in the first sample taken at 2 weeks after injection. The peak in the strontium elution occurred at 5 weeks. The correct arrival time for the strontium peak was achieved using a one dimensional analytic solution with time dependent dispersion. The dispersion coefficient as a function of time used to fit the conservative tracers was found to predict the peak arrival of the sorbing tracers. The K{sub d} used was the K{sub d} determined by the batch method on crushed tuff. 23 refs., 9 figs., 2 tabs.

Physical Description

14 p.

Notes

NTIS, PC A03/MF A01 - OSTI; OSTI as DE90003190

Source

  • Migration `89: 2nd international conference on chemistry and migration behavior of actinides and fission products in the geosphere, Monterey, CA (United States), 6-10 Nov 1989

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  • Other: DE90003190
  • Report No.: LA-UR--89-3734
  • Report No.: CONF-891120--7
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 137561
  • Archival Resource Key: ark:/67531/metadc620093

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • December 1, 1989

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  • June 16, 2015, 7:43 a.m.

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  • Feb. 29, 2016, 10:06 p.m.

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Rundberg, R.S.; Triay, I.R.; Ott, M.A. & Mitchell, A.J. Observation of time dependent dispersion in laboratory scale experiments with intact tuff, article, December 1, 1989; New Mexico. (digital.library.unt.edu/ark:/67531/metadc620093/: accessed January 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.