Fig. 12: ToF-SIMS profiles for samples A and B after tracing for 24 h in a solution enriched in H₂¹⁸O.

The alteration fronts are shown by the vertical dotted lines. The isotopic ratios ¹⁸O/¹⁶O are quantitative, and given on the axis on the right. The alteration layer formed on the irradiated glass incorporated ~3 times more H₂¹⁸O than the non-irradiated glass.