Correction factors for photo peak efficiencies of a LEPS and 60ml Ge detectors due to source sizes

The correction factors are obtained from the following two methods; (1) the relative distribution of the photo peak efficiencies of the detectors as a function of the position of a point source, which is measured by removing the source on the plane parallel with the surface of the detector at the plane-detector distances specified; and then the factors are calculated by intergating the efficiencies distributing within the circular regions of any of sizes; and (2) also obtained from the practical relation between the efficiencies, which is measured directly for circular disk sources and those for point sources. The factors thus obtained from the different methods are compared in those cases which are within a 15 mm radius. (author)