He-ion Damage and He-release from Spinel MgAl(2)O(4)
Spinel is one of the candidate matrices for transmutation of radiotoxic actinides in nuclear reactors. During the transmutation process, large quantities of He are formed by (X-decay. The behavior of He in spinel and its release upon heating are therefore of large interest. To obtain relevant information, single crystals of stoichiometric spinel MgA12O4 were implanted with He-ions of three energies: 100,260 and 2 MeV. The Rutherford backscattering/channelling (RBSI C) technique was used to measure damage formation as a function of He-fluence, and samples irradiated to different fluences were annealed in a Knudsen cell to measure the release of He. Depending on fluence and heating rate, spalling of the implanted layer, blister formation or release compatible with a diffusion process were observed. The RBS/C measurements showed damage areas at the end of the range of the He, and little damage between the surface and the depth of the range. Spinel is thus structurally stable against He-ions, even at very high concentrations.
Bibliographic Reference: Article: Nuclear Instruments Methods in Physics Research B, 166-167 (2000) pp: 263-265; Oral Report, 10th International Conference on Radiation Effects in Insulators, Jena, (DE) 19-23 July 1999
Availability: 1 as paper EN 60448 ORA
Record Number: 200012838 / Last updated on: 2000-11-07
Original language: en
Available languages: en