Spline and polynomial models of the efficiency function for Ge gamma-ray detectors in a wide energy range

Applicability of linear parameter functions for fitting the full-energy peak efficiency of n-type Ge gamma-ray detectors has been examined over a wide energy range of 50-8500 keV. Six different analytical functions were compared and it was shown that higher-order polynomial functions on a log-log scale gave the best performance. However, there is a drawback to using the log-log scale when an additive function of efficiency at different energies or of the inverse efficiency has to be used in a fitting procedure. Applicability of higher-order polynomial and spline functions to linear and inverse efficiency, but logarithmic energy scales, is examined. (author)