Predicted mechanisms for radiation enhanced helium resolution in uranium dioxide

David C. Parfitt, Robin W. Grimes

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

Classical molecular dynamics has been performed to predict the behaviour of helium gas bubbles in uranium dioxide, UO2, when subjected to displacement cascades that mimic the effects of self-irradiation damage. The models presented here examine bubble sizes of 2 and 4 nm with several different gas densities and displacement cascades with energies of up to 50 keV. Of particular interest are the mechanisms by which helium atoms can be returned to solution in the lattice through interaction with displacement cascades. This occurs both via ballistic recoil from high-energy ion fragments traversing the bubble and also a damage assisted resolution whereby the high-pressure gas intermixes into the disordered cascade regions formed adjacent to the surface of the bubble.

Original languageEnglish
Pages (from-to)216-222
Number of pages7
JournalJournal of Nuclear Materials
Volume381
Issue number3
DOIs
Publication statusPublished - 15 Nov 2008
Externally publishedYes

Fingerprint

Uranium dioxide
Helium
Cascades (fluid mechanics)
dioxides
uranium
cascades
bubbles
Gases
helium
Radiation
Density of gases
radiation
Ballistics
Molecular dynamics
Irradiation
Ions
damage
Atoms
gas density
helium atoms

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering
  • Materials Science(all)

Cite this

Predicted mechanisms for radiation enhanced helium resolution in uranium dioxide. / Parfitt, David C.; Grimes, Robin W.

In: Journal of Nuclear Materials, Vol. 381, No. 3, 15.11.2008, p. 216-222.

Research output: Contribution to journalArticle

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