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We report the effects of radiation damage on helium diffusion in zircon usingdata from molecular dynamics simulations. We observe an increase in activationenergy for helium diffusion as a result of radiation damage and increasingstructural disorder. The activation energy in a heavily damaged region issmaller than in a completely amorphous system which is correlated withremaining order in the cation sublattices of the damaged structure not presentin the fully amorphized system. The reduction of activation energy is relatedto the disappearance of fast diffusion pathways that present in the crystal.Consistent with the change in activation energy, we observe the accumulation ofhelium atoms in the damaged structure and discuss the implications of thiseffect for the formation of helium bubbles and zircon's performance as anencapsulation material for nuclear waste.

Radiation damage effects on helium diffusion in zircon