Self-radiation damage in plutonium and uranium mixed dioxide

Masato Kato, Akira Komeno, Hiroki Uno, Hiromasa Sugata, Nobuo Nakae, Kenji Konashi, Motoaki Kashimura

Research output: Contribution to journalArticlepeer-review

37 Citations (Scopus)


In plutonium compounds, the lattice parameter increases due to self-radiation damage by α-decay of plutonium isotopes. The lattice parameter change and its thermal recovery in plutonium and uranium mixed dioxide (MOX) were studied. The lattice parameter for samples of MOX powders and pellets that had been left in the air for up to 32 years was measured. The lattice parameter increased and was saturated at about 0.29%. The change in lattice parameter was formulated as a function of self-radiation dose. Three stages in the thermal recovery of the damage were observed in temperature ranges of below 673 K, 673-1073 K and above 1073 K. The activation energies in each recovery stage were estimated to be 0.12, 0.73 and 1.2 eV, respectively, and the corresponding mechanism for each stage was considered to be the recovery of the anion Frenkel defect, the cation Frenkel defect and a defect connected with helium, respectively.

Original languageEnglish
Pages (from-to)134-140
Number of pages7
JournalJournal of Nuclear Materials
Issue number1
Publication statusPublished - 2009 Aug 15

ASJC Scopus subject areas

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


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