Performance of a high purity Ge gamma detection system cooled by a cryogenic refrigerator

The energy resolution and thermal performance of a high purity Ge-detector system cooled by a cryogenic refrigerator is described. The mechanical vibrations of the cryomachine are damped effectively leading to a degradation in energy resolution of 200 eV only. Cool-down time is two hours and output pulse height stability is excellent between 82 and 94 K. For data display and spectrum analysis an economic personal computer-based system is used.