Ti and Ti-6Al-4V alloy samples were hydrogenated at different temperatures from 150degreesC to 750degreesC. They were analyzed using elastic recoil detection analysis (ERDA) with 3 MeV alpha particles and Rutherford Backscattering Spectrometry (RBS) with 6.585 MeV alpha particles. ERDA shows an increase in the amount of hydrogen absorbed for temperatures greater than 550degreesC in both materials, reaching concentrations of almost 3 x 10(22) H atoms/cm(3). The Ti shows cracks after hydrogenation and loses its mechanical properties; not so the Ti-6Al-4V alloy. A subsequent loss of hydrogen was measured in all the samples after several months. (C) 2003 International Association for Hydrogen Energy. Published by Elsevier Science Ltd. All rights reserved.