Characterization of defect accumulation in neutron-irradiated Mo by positron annihilation spectroscopy

Morten Mostgaard Eldrup, Meimei Li, L.L. Snead, S.J. Zinkle

    Research output: Contribution to journalJournal articlepeer-review


    Positron annihilation lifetime spectroscopy measurements were performed on neutron-irradiated low carbon arc cast Mo. Irradiation took place in the high flux isotope reactor, Oak Ridge National Laboratory, at a temperature of 80 +/- 10 degrees C. Neutron fluences ranged from 2 x 10(21) to 8 x 10(24) n/m(2) (E > 0.1 MeV), corresponding to displacement damage levels in the range from 7.2 x 10(-5) to 2.8 x 10(-1) displacements per atom (dpa). A high density of submicroscopic cavities was observed in the neutron-irradiated Mo and their size distributions were estimated. Cavities were detected even at a very low-dose of similar to 10(-4) dpa. The average size of the cavities did not change significantly with dose, in contrast to neutron-irradiated bcc Fe where cavity sizes increased with increasing dose. It is suggested that the in-cascade vacancy clustering may be significant in neutron-irradiated Mo, as predicted by molecular dynamics simulations. (C) 2008 Elsevier B.V. All rights reserved.
    Original languageEnglish
    JournalNuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms
    Issue number16
    Pages (from-to)3602-3606
    Publication statusPublished - Aug 2008


    • molybdenum
    • neutron-irradiation
    • positron annihilation
    • radiation damaged
    • cavities
    • nano-voids


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