Abstract
Studies with low-energy gamma-radiation show a dead layer of a thickness of about 1 mm at the surface of the intrinsic region of Ge(Li) detectors. Predominantly due to hole trapping in dead layer, low-energy gamma-spectroscopy below 100 keV with great-volume high-resolution Ge(Li) detectors is strongly degraded. A distinct improvement of the charge collection properties of the detector for low-energy gamma-quanta is achived, when the instrinsic region is simultaneously illuminated with infrared light in the energy range 0.69–0.82 eV. Consequently, utilizing this technique, it becomes possible to use great-volume Ge(Li) detectors for gamma-spectroscopy down to energies of about 30 keV.
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