Figure 2

Normalized H contents as a function of the measurement dose for 1.6 MeV \(\hbox {He}^+\) ERDA experiments. Squares represent data for Kapton as reference for H, while full and open dots denote samples ‘C’ and ‘D’ (\(p_H/p = 0.1\) and 0.2), respectively. The dotted line shows linear extrapolation to zero dose for sample ‘D’.