Specifications include, but are not limited to: a. GEM Coaxial P-type HPGe Gamma-Ray Detector (pop-top): Energy resolution full width half maximum (FWHM) at 1.33 MeV Relative Efficiency >=40% Energy Resolution @ 122 keV = 0.87 keV Energy Resolution @ 1.33 MeV = 1.85 keV Peak to Compton >=64:1 Peak shape, FW.1M/FWHM=1.9 Peak shape, FW.02M/FWHM typical=2.6 Endcap diameter=76 mm (3.00 in) Monte Carlo Drawing included b. DSPEC-jr-2.0: 240 x 160 pixel backlit LCD USB connections Coarse Gain: 1,2,4,8,16,32; fine gain:0.45 to 1 Low frequency rejector removes <3khz input noise from spectrum Automatic digital pole-zero adjustment Digital gates baseline restorer Internal battery backed up memory to maintain settings in the event of a power interruption Preamp power of 1 W maximum 3.2 x 8 x 9.8 inches in size c. X-Cooler III: 110-120 V input power <400 W power consumption during normal operation Mixed-gas, CFC-free refrigerant 60 Hz input power