ALKALI DIFFUSION AND RADIATION EFFECTS IN THE WASTE GLASS VG 98 - 12
The German waste glass VG 98/12 was implanted with Rb and Cs, and Rutherford backscattering was used to measure diffusion of the alkalis in the temperature range between 350 and 665circC. Additional measurements were made with radioactive Rb and Na, using the conventional sectioning technique to evaluate diffusion profiles. Radiation "it enhanced" Na-diffusion was observed "it during/" implantation. In contrast, radiation damage due to ion implantation "it retarded" thermally activated diffusion: The implanted ions interacted with the damage configuration resulting from ion bombardment. Damage annealing andor dissociation of Rb from the damage needed annealing temperatures of sim 500circC for Rb, and sim 600circC for the larger Cs-ions. These results were confirmed with gas release measurements using Kr and Xe. Even following annealing of the damage, Rb and Cs diffusion was much slower than that of Na. The resulting Arrhenius diagrams for Rb and Cs were curved. The implication of these results on the behaviour of the glasses under repository conditions is discussed.
Bibliographic Reference: INTERNATIONAL WORKSHOP ON RADIATION DAMAGE IN NUCLEAR WASTE MATERIALS AND REI 87, LYON/F, JULY 6-10, 1987, AVAILABILITY: CEC-LUXEMBOURG, DG XIII/A2, BP 1907, MENTIONING PAPER ORA 33745 E
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Record Number: 1989126083200 / Last updated on: 1989-05-01
Available languages: en