Efficiency of Ge(Li) thin window detectors near absorption edge of germanium

Abstract

The properties of Ge(Li) thin window detectors have been studied in the energy range 10 to 20 keV. After description of dead layer and escape effects, attention is given to the thinnest window achieved with classical technology. Influence of escape probability of X-rays is then measured with calibrated source and X-ray tube excitation, with energies as close as possible to the absorption edge of germanium. The results obtained are in good agreement with Axel's calculations and indicate that the maximum value of the efficiency attainable at 11.2 keV is 80%.