Abstract
The density change of simulated waste glass has been measured as a function of electron fluence, using the high voltage electron microscope. A very large value of swelling 0.3, was observed. It is likely that the swelling is due to the formation of oxygen bubbles. It was observed that the swelling saturated at about 0.2 displacements per atom (dpa) and additional swelling initiated beyond 0.5 dpa. Simulated waste glass was irradiated in a nuclear reactor using the 10 B( n, α) 7 Li reaction. The shrinking of the waste glass w observed and it saturated at about 0.2 dpa in which the value of shrinking was 0.0012. Several kinds of glass specimen were irradiated by γ-rays and density changes were measured. The glass of high silica content compacted, while waste glass of low silica content swelled by 0.0022 at 1.0 × 10 9 R. It can be concluded that the density change induced by γ-rays cannot be neglected, compared with the density change due to irradiation with the 10B(n, α) 7Li re α-decay of actinides.
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