11B induced radioactivation was used to study the trace determination of light elements with 1Z17. 49 nuclear reactions were investigated with ion beam energies ranging from Elab=10 MeV to Elab=27 MeV. Five elements were found to be determinable nondestructively, selectively and sensitively: Li, Be, B, Mg and Si. Nuclear interferences have also been defined and quantified. The technique has been applied to simultaneous Li-B trace determinations in glass samples and to Mg determination in Al2O3 ceramic material.