Full-energy peak efficiency of a Ge (Li) detector is a function of the detector-sample system

The semi-empiric method based on the concept of solid-angle was successfully applied to a double open-ended coaxal Ge (Li) detector with large volume. The validity of this method was examined experimentely. The solid-angles of the samples were calculated

the efficiency curve of the point source counted at the distance about 20cm from the detector was calibrated in the energy range of 50—3000keV and the polynomial fitting of the experiment data was carried out. The absolute peak efficincies to the measured samples was given. This method provides efficiency corrections for the samples and standards. Consquently

the analytical accuracy and the counting flexibility are improved.