Efficiency calibration of an extended-range Ge detector by a detailed Monte Carlo simulation

A Monte Carlo simulation has been employed for calibrating an extended-range Ge detector in an energy range from 14 to 1800 keV. A set of sources from monoenergetic and multi-gamma emitters point were measured at 15 cm from the detector window and provided 26 experimental values to which the results of the simulations are compared. Discrepancies between simulated and experimental values are within 1 standard deviation, and relative differences are, in most cases, below 1%.