RADIATION AND MECHANICAL EFFECTS IN NUCLEAR WASTE FORMS
Samples of four different borosilicate glasses, a glass ceramic and a phosphate glass were doped with 238-Pu at AERE, Harwell, to test their stability to alpha decays which are potentially the most damaging of the many radiations to which solidified highly active waste will be exposed. The leach rate of most of the materials were only slightly affected by radiation, increasing by less than a factor of two after a dose of 2.4x10**18 alpha decays per gram. Work at JRC, Ispra, was performed to investigate the basic damage mechanism in terms of production, saturation, and annealing of atomic defects and to analyse some effects of radiation damage on the structural stability of glasses (i.e. microstructural changes and etching rate variations). The experimental techniques were optical absorption, electron microscopy and calorimetry. Etching rate measurements of samples irradiated with particles of different mass and energy have been performed both before and after annealing at different temperatures. An attempt was made to find a correlation between the annealing of excess etching rate and the annealing of some types of defects. Samples used were pure silica, silica with different amounts of sodium, borosilicate glasses, and simulated waste glasses. The external sources of irradiation were electron, proton, alpha particles, neon and nickel ions and the internal sources were uranium fission fragments. Only calorimetric measurements were performed on the fission fragment damaged sample.
Bibliographic Reference: RADIOACTIVE WASTE MANAGEMENT AND DISPOSAL, LUXEMBOURG (GRAND-DUCHY OF LUXEMBOURG), APRIL 22-26, 1985 WRITE TO CEC LUXEMBOURG, DG XIII/A2, POB 1907 MENTIONING PAPER E 32005 ORA
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Record Number: 1989123071800 / Last updated on: 1987-01-01
Available languages: en