Wednesday, June 20, 2007 - 8:30 AM
The Summit (Boise Centre on the Grove)

Modeling radiation effects in ceramics for immobilization of actinides

William J. Weber and Ram Devanathan. Pacific Northwest National Laboratory, Richland, WA

Radiation effects from alpha decay in crystalline oxide host phases for the immobilization of actinides generally lead to amorphization, macroscopic swelling and increases in dissolution rates. The results of computer simulations, new models, and experimental studies in several relevant materials using short-lived actinides and ion-beam irradiation methods will be presented to highlight the fundamental understanding and models of alpha-decay effects in materials developed over the past 25 years. Ion-beam irradiation techniques have been demonstrated to be very effective in simulating radiation effects from alpha decay over a large range of experimental conditions in order to develop more detailed scientific understanding and predictive models. The integration of computer simulations into these studies have advanced the interpretation of experimental results and led to the development of a comprehensive atomic-level understanding of radiation damage processes and predictive models of the complex evolution of radiation damage in actinide waste forms with time and temperature.