The LDM100-GEM from the Ortec Products Group of Ametek Advanced Measurement Technology is an integrated gamma-ray spectrometer for fixed and mobile counting room applications. The compact self-contained laboratory detector module (LDM) generates <20 W of waste heat. It includes a high-purity germanium detector element encapsulated within a cryostat and cooled by a miniature cryocooler, so there is no need to thermal cycle during partial warm-up. It is powered from a 10- to 17-VDC supply and has a built-in battery backup that provides an additional 3 h of operation during a power failure. It includes a built-in high-stability digital signal processor. An AC or DC power source and a PC on which to install the accompanying Maestro MCA software make a complete gamma spectrometry system.