Excitation functions for the reactions "Al(' Li, X)"'"Na at ' Li-projectile energies between 25 and 153 MeV have been measured. Cross sections at 17 different energies were obtained with an uncertainty of < 16% for "Na and < 20% for "Na. The data are well suitable for beam current monitoring of high energetic ' Li-beams, since AI is an easily available target material and the cross sections ränge from 10-50 mb, thus being sufficiently high.