For several years 7 Be measurements have been conducted at high-altitude stations in Austria (Sonnblick, 3106m), Switzerland (Jungfraujoch, 3580m), Germany (Zugspitze, 2962m), and Italy (Mt. Cimone, 2165m) with the aim to support a study on vertical ozone transport in the Alps (VOTALP project).Aerosol samples, collected on filtering media with high volume samplers, are analysed for 7 Be by high-resolution γ-spectrometry.Prior to evaluation of the 7 Be time series of the four stations, both sampling and measurement procedures were checked for comparability. The results of an intercomparison exercise performed within the mentioned project are reported.