[en] The relative efficiency of a cylindrical Ge(Li) detector has been measured as a function of the angle of incidence and the energy of the gamma rays (660, 898, 1369, 1836 and 2754 keV), for three source-to-detector distances (4.6, 8 and 10 cm between the source and the front face of the detector container). These data are used to calculate values of the attenuation factors, Q sub (k), for use in angular distribution analysis and to calculate the Doppler broadening arising from the finite solid angle of the detector subtended to a moving source. (author)