First positron annihilation lifetime measurement of Pu

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We have made the first measurement of defects in an aged sample of {delta} phase, Ga stabilized Pu, using positron annihilation lifetime spectroscopy. This measurement validates the procedure necessary to perform measurements on this highly toxic material and obtain data representative of sample conditions. Comparison of the positron annihilation lifetime analysis of the data with calculated values suggests that He filled vacancies or vacancy clusters dominate the defect population. Such defects are the necessary precursor to void growth and swelling. The evolution of defects resulting from the radioactive decay of Pu during its life in the stockpile is one of ... continued below

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7 p.

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Colmenares, C.; Howell, R.H.; Ancheta, D.; Cowan, T.; Hanafee, J. & Sterne, P. November 21, 1996.

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Description

We have made the first measurement of defects in an aged sample of {delta} phase, Ga stabilized Pu, using positron annihilation lifetime spectroscopy. This measurement validates the procedure necessary to perform measurements on this highly toxic material and obtain data representative of sample conditions. Comparison of the positron annihilation lifetime analysis of the data with calculated values suggests that He filled vacancies or vacancy clusters dominate the defect population. Such defects are the necessary precursor to void growth and swelling. The evolution of defects resulting from the radioactive decay of Pu during its life in the stockpile is one of the unknown quantities affecting our confidence in predictions of the limit on stockpile components. Radiation damage leads to changes in the size and strength of metals studied for reactor and accelerator use and similar effects may be expected in Pu. The evolution of radiation produced vacancies into larger void structures and accompanying macroscopic swelling may occur in Pu at some age. A detailed understanding of the defects in self irradiated Pu is required to predict the time scale of void swelling and related radiation effects. 1 fig.

Physical Description

7 p.

Notes

INIS; OSTI as DE97052053

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  • Other Information: PBD: 21 Nov 1996

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  • Other: DE97052053
  • Report No.: UCRL-ID--126003
  • Grant Number: W-7405-ENG-48
  • DOI: 10.2172/491854 | External Link
  • Office of Scientific & Technical Information Report Number: 491854
  • Archival Resource Key: ark:/67531/metadc679332

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  • November 21, 1996

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  • July 25, 2015, 2:21 a.m.

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  • Feb. 16, 2016, 7:14 p.m.

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Colmenares, C.; Howell, R.H.; Ancheta, D.; Cowan, T.; Hanafee, J. & Sterne, P. First positron annihilation lifetime measurement of Pu, report, November 21, 1996; California. (digital.library.unt.edu/ark:/67531/metadc679332/: accessed July 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.