Large volume Ge detectors require efficient methods of background reduction if radionuclide analyses at very low-levels are
planned. It is advisable therefore to carry out simulations of background characteristics of Ge detectors in advance of installations
of low-level Ge-spectrometers either in surface or underground laboratories. We present results of Monte Carlo simulations
of background characteristics of Ge detectors in surface laboratories with various lead shielding without and with anticosmic
shielding, as well as in underground laboratories operating at different depths.