In the use of gamma-ray spectroscopy for absolute activity determinations, the peak to total ratios must be known. These ratios were measured, for an energy range of 0.515 MeV to 1.332 MeV, for a Ge(Li) detector of cylindrical shape with radius 1.13cm used with a 512 channel analyzer. The observed photopeaks were assumed to fit a gaussian function from which the contributions from the photopeaks were calculated. The results were graphically displayed.
