Analysis of Density Changes in Plutonium Observed from Accelerated Aging Using Pu-238 Enrichment

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We present dimensional and density changes in an aging plutonium alloy enriched with 7.3 at.% of {sup 238}Pu and reference alloys of various ages. After 45 equivalent years of aging, the enriched alloys at 35 C have swelled in volume by 0.14 to 0.16% and now exhibit a near linear volume increase, without void swelling. Based on X-ray diffraction measurements, the lattice expansion by self-irradiation appears to be the primary cause for dimensional changes during the initial 2-3 years of aging. Following the initial transient, the density change is primarily cause by a constant helium in-growth rate as a result ... continued below

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Chung, B. W.; Saw, C. K.; Thompson, S. R.; Quick, T. M.; Woods, C. H.; Hopkins, D. J. et al. July 11, 2006.

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We present dimensional and density changes in an aging plutonium alloy enriched with 7.3 at.% of {sup 238}Pu and reference alloys of various ages. After 45 equivalent years of aging, the enriched alloys at 35 C have swelled in volume by 0.14 to 0.16% and now exhibit a near linear volume increase, without void swelling. Based on X-ray diffraction measurements, the lattice expansion by self-irradiation appears to be the primary cause for dimensional changes during the initial 2-3 years of aging. Following the initial transient, the density change is primarily cause by a constant helium in-growth rate as a result of {alpha}-particle decay.

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PDF-file: 14 pages; size: 0.6 Mbytes

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  • Presented at: Plutonium Futures 2006, Pacific Grove, CA, United States, Jul 09 - Jul 13, 2006

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  • Report No.: UCRL-CONF-223081
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 900066
  • Archival Resource Key: ark:/67531/metadc879650

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  • July 11, 2006

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  • Sept. 22, 2016, 2:13 a.m.

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  • Nov. 22, 2016, 6:13 p.m.

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Chung, B. W.; Saw, C. K.; Thompson, S. R.; Quick, T. M.; Woods, C. H.; Hopkins, D. J. et al. Analysis of Density Changes in Plutonium Observed from Accelerated Aging Using Pu-238 Enrichment, article, July 11, 2006; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc879650/: accessed November 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.