Positronium in silica-based glasses

Y. Sasaki, Y. Nagai, H. Ohkubo, K. Inoue, Z. Tang, M. Hasegawa

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)


Structural subnanovoids in silica-based glasses (synthetic silica, borosilicate glass, lead glass, alkali barium glass, soda-lime glass and model glass of radioactive waste glass) with several SiO2 concentrations are studied by positron lifetime and one-dimensional angular correlation of annihilation radiation spectroscopy. The average sizes of the structural subnanovoids are estimated from the pick-off annihilation rates of the ortho-positronium and from the momentum distribution of the para-positronium. It is observed that the sizes of the subnanovoids and the positronium intensities decrease with decreasing SiO2 concentrations in the glasses, which suggests that the positronium is a unique and useful tool for subnanovoids in glass materials.

Original languageEnglish
Pages (from-to)569-572
Number of pages4
JournalRadiation Physics and Chemistry
Issue number3-4
Publication statusPublished - 2003


  • 1D-ACAR
  • Positron lifetime
  • Positronium
  • Radioactive wastes glassification
  • Silica-based glass
  • Structural subnanovoid


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