Abstract
To avoid losses due to coincidence summing, the efficiency calibration of gamma-spectrometers is often carried out by means of radionuclides emitting only one photon during a single decay. Calibration with this kind of radionuclides has, however the disadvantage that the energy range of the gamma rays (46 keV< E<1115 keV) is limited. Coincidence-summing corrections can be calculated with the Monte Carlo program Germanium Spectrometry Correction for multi gamma radionuclides which emit photons with energies above this range. The efficiency curve as a function of energy can therefore be extended up to 2.7 MeV with uncertainties below 4%.
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