Effects of heterogeneity on actinide diffusion rates in tuffaceous rock

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The pore structure and mineralogy of Topopah Spring Tuff are heterogeneous on scales less than one cm. This heterogeneity creates spatial variation in transport rates for aqueous actinide species both on the scale of tenths of microns and the scale of mm. The volumetric distribution of fluid paths having very different tortuosity, and potentially differing surface mineralogy and sorptive properties, must be considered in order to provide realistic predictions of transport rates. In addition, size and speciation of actinides in solution must be characterized since coexisting species can diffuse at different rates through the porous material due to both filtration ... continued below

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Buchholtz ten Brink, M.; Phinney, D. L. & Smith, D. K. April 1, 1991.

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Description

The pore structure and mineralogy of Topopah Spring Tuff are heterogeneous on scales less than one cm. This heterogeneity creates spatial variation in transport rates for aqueous actinide species both on the scale of tenths of microns and the scale of mm. The volumetric distribution of fluid paths having very different tortuosity, and potentially differing surface mineralogy and sorptive properties, must be considered in order to provide realistic predictions of transport rates. In addition, size and speciation of actinides in solution must be characterized since coexisting species can diffuse at different rates through the porous material due to both filtration effects and differences in sorption onto exposed mineral surfaces. 11 refs., 8 figs., 2 tabs.

Physical Description

10 p.

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INIS; OSTI as DE91013491

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  • 2. annual American Nuclear Society (ANS) international high level radioactive waste management conference, Las Vegas, NV (United States), 28 Apr - 3 May 1991

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  • Other: DE91013491
  • Report No.: UCRL-JC--104754
  • Report No.: CONF-910435--86
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 138119
  • Archival Resource Key: ark:/67531/metadc620960

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Office of Scientific & Technical Information Technical Reports

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  • April 1, 1991

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  • June 16, 2015, 7:43 a.m.

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  • Feb. 23, 2016, 6:39 p.m.

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Buchholtz ten Brink, M.; Phinney, D. L. & Smith, D. K. Effects of heterogeneity on actinide diffusion rates in tuffaceous rock, article, April 1, 1991; California. (digital.library.unt.edu/ark:/67531/metadc620960/: accessed April 24, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.