Spectroscopy grade gamma detectors produced from high-purity P-type germanium has become the defecto standart. The primary reason is because P-type material has historyically been produced with higher yields than N-type material thus offering a greater variety in selection and lower costs. The identifying characteristic of these detectors is an effective gamma energy response range of 40 keV to 10 MeV. These detectors are relatively rugged with a totally enclosed aluminum end-cap, can be temperature cycled, are readily available in a variety of efficiences and resolution categories, and are the most economical of the high-purity germanium series.