Modifications of sodium concentration profiles after electron and proton irradiation of glasses

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Abstract
In this work we studied the effect of electron and proton irradiation on the depth distribution of sodium in commercial soda-lime glasses. Samples have been irradiated at different energies and fluences. The 23Na (ρ, α) 20Ne nuclear reaction has been used to determine the sodium profiles. No detectable changes in the sodium concentration profiles have been introduced during the measurements, the proton fluences and doses needed in this type of analysis being very low. The obtained results support the hypothesis that the driving force for Na diffusion is mainly connected to the build-up of an electric field whose direction is determined by the projectile charge, while Na mobility changes because of the local temperature increase due to the beam power dissipation.

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